Orex Exploration is Canada's junior advanced stage gold exploration company headquartered in Montreal, Quebec. It operates in Nova Scotia, Canada with a focus on exploring former gold and property mines in Goldboro, Nova Scotia, and the area around Guysborough County, Nova Scotia.
The property owned by Orex is the site of the former Richardson Boston Mine, Mt. Dolliver Mine, Western Gold Mine, and the Eastern Gold Mine operating between 1892 and 1912.
Video Orex Exploration
Property Description
Orex's Goldboro main property consists of 37 contiguous claims (600 acres) held under license from the Province of Nova Scotia. Located along the east coast of Nova Scotia and wholly owned by Orex. The property is located 185 kilometers northeast of Halifax and is accessible by 2.5 miles of paved road from Highway 316 that connects the village of Goldboro, Nova Scotia to the town of Antigonish, NS. The main project location is found in Latitude: 45 Â ° 10 Â ° North; Longitude: 61 Â ° 40 Â ° West Longitude (NTS 11F/04)
On November 26, 2009, after a Joint Venture Agreement with Osisko Mining, Orex staked hundreds of additional claims covering 960.8 square kilometers in the vicinity of the Goldboro strike area. The current claim map highlighted in yellow is below. Initial exploration of this claim is now underway.
Maps Orex Exploration
Current Resource Estimate
In September 2009, Orex published a Mineral Resource Estimation in accordance with National Instrument Standard 43-101. They present an approximate resource with various cut values, the two most prominent are represented below:
With a cut-off value of 0.5 g/t Au, the Mineral Resources is as follows:
- 519.000 ton with 3.08 g/t AU (51,400 ounces) in the Measurable category
- 7,414,000 at 2.06 g/t Au (491,400 ounces) in the Indicated category; and
- 7,933,000 with a value of 2.13 g/t Au (542,800 ounces) under the Inferred category.
Measured, Indicated and Inferred Resources represent a total of 15,866,000 tonnes grading 2.21 g/t Au (1,085,600 ounces).
The result of 2009 Mineral Resource Estimation with cut-off value of 1.50 g/t Au is as follows:
- 270,000 tons with 4.99 g/t Au (43,300 ounces) in the Measurable category
- 2,441,000 ton at 5.99 g/t Au (353,900 ounces) in Indicated category; and
- 3,438,000 tons with 3.67 g/t Au (405,900 ounces) in Inferred category.
Measured, Indicated and Inferred Resources represent a total of 2,711,000 tonnes grading 4.56 g/t Au (803,100 ounces).
The main problem with this estimate is that 96 DD samples used in the previous reserve estimate were rated 0 g/t in the model because less than the complete historical sampling required for the new geological model used. This results in a much lower-than-expected resource. Orex currently resampling areas covered by these holes and new areas.
Cooperation with Osisko
On November 12, 2009, Orex entered into an Option Agreement and a Joint Venture with Osisko Mining.
The key terms of the agreement are:
- Osisko invested $ 1.3 million in Orex and received 13,000,000 shares for $ 0.10/share
- Osisko received 13,000,000 warrants for one common share at $ 0.125/share for 3 years
- Osisko receives a 50% interest in the property before 29 September 2013 if he/she issues exploration/development expenses:
- $ 1,500,000 before September 29, 2010
- $ 3.5 million (aggregate) on or before September 29, 2011
- $ 8.0 million (aggregate) on or before September 29, 2013
- Osisko may receive a 60% interest in the property if it completes the prefeasibility study before September 29, 2015
Between November 12, 2009 and September 29, 2015 Osisko is the project manager, with a joint management committee during the option period with two representatives from each party. The Management Committee will be responsible for revising the program proposed by Osisko and for approving and evaluating the results of all programs. Osisko has a casting tie sound.
On November 1, 2010, Orex reported that Osisko had spent exploration and development expenses in excess of the minimum $ 1,500,000 required on September 29, 2010. (The actual amount issued was reported at $ 3,120,000 in Osisko November 11, MD & amp; A) Osisko insists that it will continue to incur costs under the Option and Joint Venture Agreement. Drilling plans and budgets for the next stage of drilling campaigns at Goldboro Gold Property should be prepared. In Osisko, March 31, 2011, MD & amp; A company reports that the cumulative expenditure on the Goldboro property is $ 2,928,000.
On September 29, 2011, Osisko and Orex jointly announced that Osisko has allowed the option on the property to expire by not meeting the minimum spending requirements. Osisko stated "Despite the results of the 2010 and 2011 drilling campaigns are encouraging, they suggest smaller deposits that could potentially be used with selectively underground methods that are focused on blood vessels, or alternatively the relatively shallow open pit operation, both of which are outside the scope of exploration and strategy acquisition of Osisko. "
Current exploration activities (2009 to 2011)
Joint venture exploration activities
On January 27, 2010, Orex and Osisko started their first joint exploration. Three parts of the campaign are planned with two exercises. Osisko started with a 4.728 m/18 hole Phase 2F drilling campaign, for some incomplete and/or incompatible historical drill results mainly in the deeper part of the Mineral Ramp Resources Area and extends westward to West Goldbrook. After Phase 2F, Osisko continued with 2D Phase drilling campaigns (5.492 m/28 holes) and 2E (2,769 m/13 holes), which continued west along the remaining 1.7 km segment of Boston Richardson Deformation Zone from Ramp through West Goldbrook to Dolliver Mountain.
On 29 April 2010, 59 holes for 2D, 2E and 2F Phase drilling campaigns, representing 12,989 meters, were completed. The 600m unfolded gap still exists between West Goldbrook and Doliver Mountain.
During the same period Nova Scotia based on Mercator Geological Services Limited and D.R. Duncan & amp; Associates Ltd., retained and completed regional compilations on the Goldboro Extension Property 960.8 km2. A number of Goldboro-type gold targets are identified and currently being drilled using Reverse Circulation ("RC") methods to restore basal and rock bottom samples for gold analysis and whole-rock analysis. To date 194 RC drill holes are completed for 1,513 meters and 758 samples are taken.
On November 18, 2010, highlights of 64 holes have been released. Significant mineralization was found in 12 of them. Includes four bedrock samples with levels of 2.3 g/t, 4.23 g/t, 10.85 g/t & amp; 25.65 g/t.
On February 8, 2011, Orex management announced that Osisko will conduct further Diamond Drilling on 10 targets. Four holes west of the West Goldbrook strike area to validate the collapse of West Goldbrook formation, and six east of the East Goldbrook area on a 750meter area of ​​new prospects identified by RC drilling. This drilling will begin in March 2011.
On April 20, 2011, Orex and Osisko announced drilling had begun on three diamond drill holes spaced 200 meters apart at GoldBrook West to the crevice of Mount Dolliver where there had been no previous drilling. In addition six drill holes will be drilled on 3 sections 250 m apart from East Goldbrook to the eastern property boundary. Reverse circulation drilling in 2010 shows a trend of mineralization in this area. On August 11, 2011 Orex and Osisko announced the results of this drilling campaign. A total of 10 holes were drilled. Significant new mineralized additions have been identified in the area between East Goldbrook and the Eastern Property Bound including the gold intersections tested at 1570 grams/ton over half a meter core, and another sample of 410 g/t over 1/2 meter of core.
Independent exploration activities
In addition to exploration activities undertaken with Osisko, Orex conducts field exploration activities on many claims that are not shared with Osisko. This exploration activity is guided by a Regional Compilation study funded through Joint Venture with Osisko. This information was officially revealed on November 30, 2010, although it has long been known to have occurred to locals and people close to the project.
On November 30, 2010 further details of the company's field exploration activities have been released. New mineralization is noted in western claims on the Goldenville and Stillwater Claims. Includes quartz quartz outcrop discovery at Goldenville Anticline which has samples of 12,665 g/t, and discovery of a 12m 600m quartz vein to the south of this outcrop. The company also reported float samples with levels of 0.121 g/t in areas close to the Stillwater anticline with an anomalous occurrence of historic gold. The company also announced that it had started field exploration work several weeks earlier.
Geological interpretation
This property is located inside Meguma Supergroup from the eastern Appalachian Belt Canada. This property is fully constituted by sedimentary rocks from the Goldenville Group, which consists of greywacke, sandstone (arenite), and modified slate. Sediment stratigraphic succession from the Goldboro area is influenced by the anticline Harbor Seal Upper. This anticline is erect, winding with the ENE trend with a decrease of 10 ° to 30 ° eastward. At the peak of the anticline, the slate unit is thicker than other sedimentary rock types. The following diagram illustrates Goldenville & amp; Upper Seal Harbor Anticlines and the relative location of gold mineralization explored by Orex and Osisko:
Goldboro mineralization has previously been referred to as the lode-gold deposit type "saddle reef". In Nova Scotia, the Boston-Richardson (Upper Seal Harbor district) mine is a classic example of a "saddle coral" deposit. Gold mineralization at Goldboro occurs in association with and within a swarm of quartz veins located on the hinges of regional anticlines, especially in black-flaked rock wall flocillit. As such, Goldboro is not a "saddle reef" gold deposit type. The finely folded sediment unit has a constant thickness on the limb but not in the folded hinges, indicating bending as a folding mechanism. Many of the key features in the gold deposit in the Upper Seal Harbor district suggest that the fold itself should be considered a process of gold mineralization.
Gold mineralization at Goldboro occurs in quartz veins and sulfides that are scattered on rock walls. The mineralized wall stones are mostly, but not exclusively, composed of shale-argillite (slate). Locally, greywacke and arenite are cut by quartz and mineralized veins. Veins are characterized by quartz, sulphides (arsenopyrite auriferous) and native gold (seen gold fragments have historically been observed in some slate belts). Rock walls generally contain more sulphides than veins, in the form of arsenopyrite.
Exploration by Orex from 2005-2008 shows that in certain sections of the sedimentary sequences the sandstone rock contains sufficient intervening veins and mineralization combined with slate shapes/units forming large zones of lower classes that may be mined by open pit methods.
Drilling 2010 reveals the possibility of further revision of interpretation as they see strong subvertical influence in possible mineralized locations along the subvertical shear zone (s).
The short-term focus is the identification and representation of the maximum amount of low-cost near-surface that could potentially open up the pit resources. This will be followed by a deeper and deeper higher-level resource investigation for potential economically viable or independent free underground operation for potential open pitting.
Faribault
In 1885, E.R. Faribault charted the Nova Scotia goldfield for the Geological Survey Department (Government of Canada). He focuses on intricate folds in gold formations along the southeast coast of Nova Scotia known as the Meguma Group. He admits that gold happens like a saddle along the top of a small anticline and he finds many large ore and small bodies. His discovery is vital to his current knowledge of gold locations in Nova Scotia.
In 1893, Map # 27 by the Department of Geological Survey was produced by E.R. Faribault to illustrate the report assigned by the Department of Hugh Fletcher and E.R. Faribault in 1886. This map (below) illustrates a well-known goldfield in the area around Goldboro. Many of these properties are currently claimed by Orex Exploration, while others are held by other mineral claim holders. In addition, a detailed cross-section of the Harbor Isaac gold district and also the Boston Richardson mine is produced by Faribault (below).
Nugget Effects
The main hurdle for the Orex is to evaluate the gold content of the mineralized belt. The distribution of gold is subject to a severe "nugget effect" with a strong segregation component. In the case of Goldboro, gold emerges as a large nugget, a smooth spread in or limiting the arsenopyrite crystals and fine gold grains associated with carbon materials. This gold grain distribution may explain the fact that the regular test method (A.A. F.A; metallics) yields a lower gold value than the metallurgical equilibrium of the factory test.
Historically, the heavy "nugget effect" generated by extreme variability in size and distribution of gold in Goldboro gold belt forces companies to implement a number of sample determination and class determination programs. The nugget effect is so extreme that collection and processing of samples of sufficient size to overcome the problematic nuggets effect using conventional analytic methods. The program has produced various types of samples tested by several different processing protocols on initial and sub-split sample sizes. The sample type includes:
- sample capture surface and underground,
- core and underground drill core samples,
- drill samples of mud,
- drill core composite sample,
- chip underground sample,
- underground stool samples, and
- underground mass examples.
The results of this test clearly indicate that a small initial sample and/or incorrect sub-split size for grinding and/or milling sizes may result in incorrect value determination.
Bendigo Ballarat
Many comparisons have been made between gold deposits in the Goldfields Central Victoria (Australia) area and the Meguma deposit from Nova Scotia (Canada). Comparison shows that this store has many similarities but also displays some differences.
The comparison between deposits in Australian Goldfields and Meguma deposits in Nova Scotia could have a significant impact on gold exploration at Goldboro and elsewhere in Nova Scotia. Australian examples show that narrow quartz gold deposits, similar to those in Nova Scotia, can be mined profitable. Further, it also shows that low grade gold concentrations (1-2 g/t Au) can be mined as economically viable deposits. In Bendigo, 22 Million ounces of gold has been produced since 1851, and about 12 Million ounces of gold has been produced in Ballarat since 1850. The exploration program in Australia shows that mineralized vein content can not be assessed without bulk sampling, and if applicable, integral to the exploration strategy.
This comparison shows that the larger potential savings are in the Orex property.
High class/low grade
Two different approaches to geological modeling can be used for resource estimation at Goldboro: mineralized zones can be defined as: (i) more narrowly folded and higher belts (about sixteen (16) belts); or (ii) they can be grouped into larger structural domains (about four (4) domains). For 2009 Mineral Resource Estimates, the first approach (eg, individual belts and not domains) is used. In both approaches, higher grade materials are in the same location - folding hinges where maximum width seems to have occurred - although differences may occur in the lower grade material distribution. Several tests have been completed using two different approaches, and both models provide the same total for the contained ounce.
History
A very detailed history of the mine and the works found on the property before 1915 can be found at Naert, Karl A. (March 1988) [1988], Review Exploration Program by Onitap Resources Inc. in Goldboro Area.... Development License No. 0114, March, 1988 (PDF) , Scarborough: Narex Ore Search Consultants Inc., pp.Ã, 24-35 Ã, summary is presented below. Boston Richardson Mine
In 1861 gold was found in quartz veins in the anticline of Isaac's Harbor. In 1892, Howard Richardson was the first to record gold in shale and quartz veins commonly known as the Boston Richardson Belt. Property mining began in 1892 when Richardson Gold Mining Company began developing a belt.
In 1896, the mine was operating at full capacity and in 1897 three shafts gave access to ores at a depth of 60m. In 1900 the main axle was a deep and selective dive mining method of 160 meters (520Ã, ft) in use and two Wilfley Consultants operated. Two additional concentrators were installed in 1901. In 1902 another drowning axis became known as the Boston Richardson Shaft, and which still exists today.
The Boston Richardson Mining Company took over the property in 1903 and returned to work on a Boston Richardson axis that they extended to a depth of 122m which was in 1905. The bromo-cyanide plant was built on the property in 1906 and the gold recovery rose to 70% The main axis has reached a depth of 213 m in 1902. The operation was suspended on August 15, 1908 due to financial difficulties. In 1909, the New England Mining Company took over operations until 1912.
In 1926, the Canadian Metals and Smelting Company acquired the property and sought to regain gold from the old mine tailings.
Dolliver Mountain Mine
An active underground mine in Dolliver Mountain between 1901 and 1905. Mount Dolliver is located west of the Boston Richardson Shaft. In 1902 the shaft had a depth of 58m and cut three ore belts one of which ("Belt Partington") was a width of 10m. In 1903 the shaft reached a depth of 81m and cut the "Forge Belt" which was 7m wide. By 1904 the shaft was 149m deep and in 1905 a drill hole was drilled 152m from the bottom of the axle which intersected several bodies of quartz and slate. This mine has remained inoperable since 1905.
West Goldbrook Mine
The West Gold Brook mine is located west of the Boston Richardson Shaft. Between 1909 and 1910 five ore belts were found at the West Gold Brook Mine. The milling test on the ore of the three belts was not satisfactory and the mine was abandoned. Locarno Copper Mines Ltd. Mashed the new shaft in the original west between 1929 and 1931. In 1931, the metallurgical test found 1.61 ounces of gold from 1.1 tonnes of short ore. In 1956, the Canso Mining Company dried the Locarno axle and did some basic exploration but the work was stopped due to financial difficulties.
East Goldbrook Mine
In 1907 a rod was sunk to the east of Boston Richardson's axis. In 1908 three ore belts were discovered and some rich ore were found in one, but no further work was recorded. The East Goldbrook shaft was drained between 1931 and 1934 by Renada Mines Ltd which took a working sample and the test yielded between 1.61 and 4.26 g/t Au.
Modern exploration
1980 to 1989
Very little documented additional work on the property until 1981 when exploration by a series of junior exploration companies returned.
In 1981, Pantino Mines Ltd undertook several geophysical surveys and in 1984, a diamond drill hole 529m was drilled in the Boston Richardson Belt. In 1985, five diamond drill holes will be drilled in former West Gold Brook mine. Each hole intercepted many slate beds but some samples were taken.
In 1987 Petromet Resources Ltd. and Greenstrike Gold Company drill an additional 5 diamond drill holes and at the end of the year Omnitap Resources Inc. completed and an additional 33 diamond drill holes. Helicopters underwent magnetic surveys and EM-16s were also performed. The purpose of this campaign is to build the depth and breadth of the Boston Richardson Belt. It is also targeted at the East Goldbrook property and is on target under Boston's Richardson Belt. This led to the detection of four additional belts under the Boston Richardson Belt and an additional belt over Boston Richardson Belt in the East Goldbrook area. This belt shows impressive gold values ​​and visible gold found in almost every hole.
Options on the property were presented to Orex Exploration in 1988.
In 1988, a surface and underground exploration program was conducted to protect the property to the west of the Richardson Boston Mine. Gold alone is found in quartz veins and free gold is found in black flakes of graphite and fourteen golden ore bearing belts have been identified. During 1988 the Boston Richardson Mine shaft was rehabilitated to facilitate the underground exploration program. Orex Exploration seeks ACOA funding to develop a modern new mine. and looking for tenders to conduct Pre-Eligibility and Feasibility Studies. In addition, the decrease in access (often called "The Ramp" and "Ramp Area") was developed to validate the results of drilling and sampling.
In early 1989 the company conducted a metallurgical test on a dirt sample from 1988 and found that the results were much higher than those determined using atomic absorption samples on core samples from the same area. (3.3g/t for cyanidition version 2.0g/t for atomic absorption). Grinding tests on several new diamond drill holes are performed.
In 1989 the company also completed Pre-Eligibility and two Feasibility Studies.
The Pre-Feasibility Study recommends underground mining, the standard gravity/float plant and concludes that a profit of $ 40 per ton will be realized.
The first feasibility study was extended to a pre-feasibility study and described three possible options, two of which involved variations in 500 metric ton/day portable and underground mining plants, and the third option involved open pit mining, selective underground mining and 5,000 metric tons/day milling. All scenarios are considered economically viable but the third option of open mines and large mills is considered to have the greatest possible return to shareholders and is a recommended option.
The second feasibility study was generated two months after the first and only recommended a modified reverse sub-level mining methodology without mentioning the open pit mining option described in the first feasibility study. This concludes that this is economical in the capital available to the firm.
The company then informed the Department of the Environment for the Province of Nova Scotia about its intention to continue the Gold Mining Project. The Company proposes to open mining and recover gold using a gravity plant by flotation and cyanide processing. Public meetings were held as part of this process on 27 March 1989 with major attention being the environmental control requirements of the government, the possibility of river contamination and site reclamation.
The company also produced an Economic Evaluation project in 1989 that estimated an average of 195 direct jobs and 293 indirect jobs will be made annually in the first 4 years and 240 direct jobs in subsequent years. The evaluation states that a direct economic benefit of $ 13 million can be expected in the first four years of the Guysborough County region. In addition, an estimated $ 70 million expenditure in initial capital investment for equipment and machinery and subsequent expenditures of $ 12.8 million per year - much to be sourced in Guysborough and Antigonish Counties. The total project value for the community is estimated at $ 123.25 million in the first four years of operation.
Between 1989 and 1990, additional underground definition drilling was carried out and two underground rainfall samples totaling 7 metric tons were mined.
1990 to 2004
Between 1990 and 1993 very little exploration work took place on the property while the scientific debate raged on the correct way to accurately measure the value of the gold deposit and many technical reports and assessments were completed.
In 1990 the terms of reference for environmental assessment were produced and environmental assessments were conducted. The assessment concludes "No significant negative impacts are anticipated."
The main controversy is whether the deposit is a high-level deposit (due to the large number of gold nuggets) or low grade deposits (due to good gold found in slate belts). Conventional fire tests produce significantly lower yields than metallurgical tests that consistently return high-level results. The ongoing Grind Leach technique was evaluated under options with Minnova Inc., but did not produce satisfactory results. In 1992 the Vat Leach test was performed with Novagold (under option) which resulted in a value of 4-6g/t Au with an 84% recovery rate. NovaGold was forced to cancel its choice because of financial difficulties.
In 1993, Orex drilled six diamond drill holes to evaluate high grade resource levels. The results were analyzed by the CRM laboratory and equally problematic, returning the same results as those found by Minnova, but with a large amount of gold found not found by the sampling protocol. This is due to the high nugget effect and the failure of large gold nuggets to dissolve in cyanide concentrations.
Placer Dome contacted Orex in 1995 and offered help because they had experienced similar sampling problems in the past. Placer sampled the pile of ore found in 1988-1989 in a very methodical way. They took samples of four rock types: Greywacke, Slate, Quartz Vein, and Vein. They throw all the samples with visible gold. The results are very encouraging showing 1 g/t in Greywacke, 2.82 g/t in Slate, 16.15 g/t in Quartz Vein and 36.37 g/t in vein.
In 1995, Placer Dome offered $ 30 million to acquire a 65% stake in the Goldboro property. Placer Dome went on to get the environmental release from the Province of Nova Scotia for past mining environmental problems (related to the turn of events of this century) delay in obtaining this release meant exploration did not start again until the end of 1995. Due to budget cuts, conventional sampling was restored by return to "previous low" results. In 1996, the Placer dome dropped his choice to focus on international property and other ventures.
The site was essentially abandoned between 1996 and 2004. Shaft houses and mechanical buildings were significantly damaged, and all core samples were largely lost.
2004 to 2009
In February 2004, MRB & amp; Partners are maintained by Orex to prepare independent technical reports on the Goldboro property. This report is a joint effort between independent consulting teams (InnovExplo Inc., A.S. Horvath Consulting, Tech2Mine Inc., and MRB & Associates), supervised by Jean Lafleur, M.Sc. (Senior Technical Advisor for Orex).
One of the reasons for this independent research is to review the geology of the Goldboro property and the Meguma district in Nova Scotia, and compare the characteristics of Meguma-style deposits to people from the Bendigo and Ballarat deposits in the Lachlan folding belt of Central Victoria, Australia. Another objective is to review the historical samples and analytical class determination procedures at Goldboro and provide an assessment of the data quality and suitability of these historical results as they relate to:
- characteristics of mineralization and recommendations for future sampling, class determination, and QA/QC protocols;
- the quality and integrity of the data to be used in resource/reserve estimates, and;
- comparison of sampling, determination of analysis and reserve estimation method with those used in sediments in Bendigo-Ballarat district.
The conclusions and recommendations derived from the study set the stage for the 2005 Orex exploration program, especially the conclusions about class determination. Horvath makes the following conclusions (among others):
- Historical sampling protocols, processing, and gold analyzes consistently underestimate value due to the extreme effects of nuggets;
- The only reliable method for obtaining accurate and precise class determination for Goldboro mineral samples is by metallurgical testing/processing of representative samples of sufficient size.
Orex started an exploration program in February 2005. Twenty-three diamond drill holes from core HQ diameters were completed with a total of 2,355 meters (BR05-001 to BR05-023). Drilling is concentrated in an area of ​​225 meters, centered on Section 8675E of the Boston Richardson belt. The individual sample weight is estimated to be 7.75 kg per meter of restored core.
The purpose of the drill program is to test a small area of ​​a known zone of shallow mineralization by drilling a fence hole at a distance of no more than 25 meters between sections. The drilling pattern and the number of proposed holes are designed to allow two (2) separate shallow areas to be tested similarly. Four (4) holes twinned to the previous hole for comparative analysis. The recognized zone of mineralization was tested using conventional fire assays with atomic absorption or gravimetric settlement, and at the end of the program, the sample composite (created by combining rejected samples from several boreholes previously analyzed by conventional fire assays) was fabricated and sent to Lakefield. Research for metallurgical testing. Resource estimates in accordance with CIM Definitions and Standards on Mineral Resources and Mineral Reserves are conducted at the end of the program by P & amp; E Mining Consultants Inc. using metallurgical sample results (Armstrong, Puritch and Horvath, 2006).
Orex started an exploration program in February 2008 consisting of a diamond drill program consisting of 12,201.5 meters in forty-five (45) holes. The average drill hole length is 250 meters. Drilling is concentrated between West Goldbrook and Goldbrook East on Crown Land rights. The goal of the exercise program is to fill in the previous drill program and test the expansion of gold mineralization to the east and west of the Boston-Richardson zone.
In September 2009, Orex commissioned a Mineral Resource Estimation in accordance with National Instrument 43-101.
Estimated previous resource
estimated resource 2006
In 2006, P & amp; E Mining was assigned to generate a new NI43-101 Resource estimate based on results from the new 2005 drilling campaign.
There is no new resource calculation for the entire strike length - only updates for the 225-m section in the Ramp Area (freshly drilled with large drill samples) are calculated. The reconciled resource beyond the 225 m stretch length of the Ramp Area for the remaining 1.5 km strike is 800,800 ounces tabulated as follows:
estimated resource 2004
In 2004, Orex commissioned the MRB & amp; Partners to generate NI43-101 resource estimates based on past exploration activities and available data. The Technical Report concluded that the resources defined at that time were 644,000 oz as summarized in the table below. It should be noted that these estimates do not apply any correction factors for extreme nugget effects.
Calculation of 1990 ore reserves
In 1990, Ore Reserve Calculations were set. This is determined between 1.4 and 2.4 million ounces of gold to be found in the area around the former Boston Richardson axle and the West Goldbrook mine:
- Ramp Area: 755,002 ton @ 1.19 to 2.42 g/t
- Main Ore: 19,500,000 tons @ 0.75 to 3.37 g/t
- West Goldbrook area: 8,614,817 tons @ 0.53 to 0.84 g/t
This estimate explicitly excludes the East Goldbrook area from this calculation and suggests that this area may contain 10 million tonnes of ore at a rate of 2.8 g/t.
calculation of ore reserves 1989
Ore Reserve calculations were produced by St-Michel Geoconseil in 1989 specifically for the portal access ramp area. It concluded that there were 1,068,547 metric tons of ore with 6.2 g/ton (not cut) gold content for about 205,000 oz of gold in the climb area.
Calculation of ore reserves 1988
In 1988, an Ore Reserve calculation that did not comply with NI43-101 was compiled by Narex Ore Search Consultants and concluded there were 1,102,036 tonnes of @ 0.194 oz/ton indicated ore, with an indication of a total of 213,694 oz gold.
Pre-1981
Reliable production figures are available only for Boston Richardson belt. From 1893 to 1912 mine production was listed as 414 887 short tons with levels of 0.132 Oz/T (376 383 tons with 4.53 g/t Au) with total production of 54 871 ounces of gold. The head value is estimated to be much higher at 6.8 g/t Au but poor technology at the time resulted in a lower recovered class. Anecdotal reports of descendants of former miners indicate that a number of losses due to theft occurred. This is possible because of the nature of the nuggets of gold found in the belt. It has been said that more gold is taken from the belt than officially reported. Some claim that some mining families have not worked for decades after mine closure but always have money to spend.
References
External links
- orexexploration.com
Source of the article : Wikipedia
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