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File Created: 12-Jan-1987 by Mary McLean (MM)
Last Edit:  20-Jun-2020 by Karl A. Flower (KAF)

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NMI 092J15 Au3
Name BRALORNE, BRALORNE MINE, LORNE (L.588), KING, WOOD CHUCK (L.579), CROWN, WEDGE, QUEEN, MADDIE, PETER, BIG SOLLY, TELEPHONE, TAYLOR, 52, ZONE B, EMPIRE Mining Division Lillooet
BCGS Map 092J076
Status Past Producer NTS Map 092J15W
Latitude 050º 46' 40'' UTM 10 (NAD 83)
Longitude 122º 49' 20'' Northing 5624910
Easting 512632
Commodities Gold, Silver, Lead, Zinc, Copper, Tungsten Deposit Types I01 : Au-quartz veins
Tectonic Belt Coast Crystalline Terrane Bridge River, Cadwallader
Capsule Geology

The area is underlain by Mississippian-Jurassic Bridge River Complex (Group) and Upper Triassic Cadwallader Group sediments and volcanics which are transected by a major north trending, steeply southwest dipping fault known as the Cadwallader Break. The fault is a deep-seated crustal structure related to the Fraser fault system to the south. The fault is intruded by small granitic to ultramafic stocks and dykes. Diorite to gabbro of the Permian Bralorne Igneous Complex, in which most of the quartz veins are hosted, intrudes the Cadwallader Break as an elongate body. Diorite also intrudes Pioneer Formation (Cadwallader Group) greenstones although at times the contact appears gradational. The diorite and greenstone are in turn "intruded" by sodic granite which may be an apophysis of the Early Tertiary Bendor pluton, the main body of which lies 10 kilometres east. The sodic granite also appears gradational with the diorite and exhibits a migmatitic texture, which has led to the conclusion that it may be a late differentiation of the same magma that formed the diorite. The sodic granite occupies the northwest half of the intrusive belt and narrows out north and south.

A 60-metre wide belt of serpentinite (Bralorne Igneous Complex) borders the diorite on the southeast at the contact with the Noel Formation (Cadwallader Group). Finally, the intrusive belt is intruded by albitite dykes which often follow the chilled margin of the sodic granite, and where associated with quartz veins, the dykes are altered to platy quartz-sericite schist. The principal host rock is the diorite, and an abnormal richness in gold was noted when veins neared the serpentinite; it has been suggested that the serpentinite acted as a dam to mineralized solutions. The veins also followed the albitite dykes and vein structures extend into other rock types (greenstones and sodic granite).

The age of the mineralization is constrained by three sets of isotope data; a zircon from a pre-syn mineralization albitite dike returns 91.4 +/- 1.4 Ma, while a K/Argon from a hornblende and the containing whole rock from a syn-post minerization hornblende porphyry dike is 85.7 +/- 3 Ma. Argon/Argon step heating of associated mariposite gives a minimum age of mineralization of 70 - 80 Ma (Bulletin 108, page 47-48).

The lens hosting quartz veins is five kilometres long by 2 kilometres wide and has a complex interlacing fault system. The main producing veins generally strike east and dip varying degrees to the north, in reverse fault zones extending from the Fergusson fault (northeast dipping) to the Cadwallader fault (southwest dipping). This zone between the faults grows wider with depth, and veins are persistent, having been mined to nearly a 2 kilometre depth. Diagonal "crossover" veins host many secondary veins which are commonly brecciated.

The Bralorne mine is divided into 3 main sections, the Crown, Empire and King. The principal veins in the Crown and Empire sections are known as the 51 and 77 veins, their faulted extensions, the 55 and 53 veins respectively, and crossover veins 59, 73, 75 and 79. The main veins in the King section are the North, Shaft, King, Alhambra and C veins. For descriptive purposes, the 51 (and 55) and 77 (and 53) veins are treated separately, under the names of the original mines, before amalgamation into Bralorne Mines. These are the Ida May mine (Empire and Blackbird) for the 51 vein - see 092JNE002, and the Coronation mine (Little Joe and Countless) for the 77 vein - see 092JNE007. The most prolific vein was the 77.

Generally, the veins average 1.5 metres in width and range up to 6 metres. They are often tabular, well-ribboned or partly ribboned, and partly massive or brecciated. All types have hosted ore, although the best values came from ribboned veins. The gangue minerals are quartz, calcite, mariposite, talc and scheelite. The principal sulphides are pyrite, arsenopyrite and sphalerite, which along with native gold, galena, chalcopyrite, pyrrhotite and tetrahedrite occupy less than one per cent of the veins. Carbonate alteration (siderite) is widespread with albite occurring along vein shears. The Bralorne mine was accessible by 4 main shafts and worked on 44 levels.

More recent work has identified the BK zone and associated parallel vein structures including the BK North, BK South, BK-9870 and BK-9790 (Alhambra) vein structures. the BK North and BK South veins are located 70.1 metres north and 53.3 metres south of the BK zone, respectively.

The BK structure dips on average at 85 degrees to the north and typically varies in width from less than 0.1 meter to 1.5 metres. The shallower dipping BK-9870 structure also dips to the North but at an angle between 30 and 65 degrees and typically varies in width from less than 0.1 meter and 2 meters. The BK-9790 (Alhambra) structure dips 85 to 88 degrees to the North and typically varies in width from less than 0.1 meter to 1.5 meters. The BK-9870 structure pinches out when it intercepts the BK structure but is thought to carry on from the other side of the structure. The BK-9790 (Alhambra) structure is believed to terminate against the BK structure. All of the structures are mineralized and host the typical mineral assemblage of arsenopyrite-pyritegalena-sphalerite in varying amounts.

Bralorne Pioneer Gold Mines Ltd., in a joint venture with International Avino Mines Ltd., plans to re-open the historic Bralorne mine encompassing the combined Bralorne, Pioneer (092JNE004) and Loco (092JNE164) properties, following issuance of a Mine Development Certificate in March 1995. Initial underground mining will be from the formerly producing Bralorne 51 vein area where detailed exploration programs, in recent years, have outlined proven, probable and possible reserves of 570,000 tonnes grading 8.22 grams per tonne gold. Proven and probable reserves above the 800 level and readily available for extraction total 432,500 tonnes grading 10.63 grams per tonne gold. There are also reserves of 549,125 tonnes grading 9.26 grams per tonne gold below the 800 level (Information Circular 1997-1, page 20). The nearby Countless vein on the Loco property has 110,000 tonnes probable and possible reserves grading 17.1 grams per tonne gold. The Peter vein was drifted along a strike length of 35 metres on the 800 level, 305 metres below the surface (T. Schroeter, personal communication, 1996). Mining and milling operations are forecast to start at about 100 to 125 tonnes per day, increasing to 400 tonnes per day at a later date. Mill tune-up and production is scheduled for mid-March 1997. Milling machinery, purchased from Zeballos, is being assembled at the property and the mill building has been rehabilitated (Information Circular 1996-1, page 17).

In 1995, Bralorne Pioneer Gold Mines Ltd., and partner International Avino Mines Ltd., with support from the Explore B.C. Program, carried out an extensive exploration program including trenching and 650 metres of surface diamond drilling in 7 holes on the Maddie zone resulting in the discovery of new veins. Underground work on the 800 level consisting of 233 metres of drifting, 100 metres of crosscuts and 544 metres of diamond drilling in 4 holes traced the Peter and Big Solly veins to and beyond a crossfault (Explore B.C. Program 95/96 - A32).

In 2003, Bralorne-Pioneer Gold Mines Ltd resumed construction of a 125 tonne-per-day pilot plant test mill and began construction of a tailings pond. Trenching and drilling were done in the area of the Peter, Cosmopolitan and Big Solly veins on the Loco property. Bralorne also did rehabilitation work on the 800 level in the Bralorne mine. In early 2004, Bralorne plans to mine a 6000 to 8000 tonne bulk sample from the Peter vein, which will be processed in the pilot mill. The drilling program consisted of 15 NQ holes totaling 1751.5 metres and was designed to provide additional information on the Peter vein and associated structures in the area beneath the upper level workings and also along strike to the north and south.

In 2004, Bralorne completed construction of a tailings pond to allow five years of production, and began test milling using a small (approximately 100 tonne-per-day) gravity/flotation pilot plant. As of mid-August more than 10 000 tonnes had been processed through the plant, producing about 141 dry tonnes of concentrate. Most of the material processed was from low-grade stockpiles with some additional material coming from the Upper Peter vein (4230 adit) on the Loco (or Cosmopolitan) property. A small amount of dore gold was produced onsite, and about 20 tonnes of flotation concentrate was shipped.

Bralorne also did underground development to prepare a stope on the Peter vein on the 800 level of the King mine workings, and drove a decline from the 4230 level to access a new level 30 metres deeper. Surface drilling returned encouraging results from the 51B vein in the gap between the Bralorne and Pioneer mine workings, and a new 180-metre long adit is being driven to access this area.

The following resource estimates were reported in The Northern Miner, April 4, 2005. It is not known if they are NI-41101 compliant. The measured resource in the Peter vein comprises 3,425 tonnes grading 8.4 grams gold per tonne. The Peter vein has been drifted on top and bottom with samples taken at 1.8 metre intervals across the exposed vein. The upper Peter vein contains another 22,738 tonnes grading 9.7 grams gold in the inferred category. The indicated mineral resource in the 51B FW vein is reported at 17,729 tonnes grading 11 grams gold. The resource was based on 43 diamond drill holes drilled this winter and five historic drill holes. The 51B FW vein intersected by the Area 51 cross-cut yielded considerably higher grades of up to 21.1 grams gold over 1.5 metres. Another inferred resource of 389,964 tonnes grading 10.4 grams gold sits above the 800-level.

During 2007 through 2012, a total of 5590.5 metres of underground development was completed on the Bralorne mine.

In 2009, exploration and development work conducted included development of the BK-800 mineralized shoot and access development for the BK and Pioneer gap areas. Two raises were driven up from the 800 Level on the BK vein to investigate the extent of mineralization above the level. A new adit and a track drift were driven 140.2 metres towards connecting the 51BFW vein on the Bralorne 400 level. A second new adit and decline was started and driven 109.7 metres to access to the upper portion of the BK vein.

Also at this time, drilling was done to further test the BK structure and explore for parallel structures. A total of 3,652 metres in 16 holes were drilled, resulting in a number of significant intercepts included 43.51 grams per tonne gold over 0.9 metres (0.6 metres true width) in hole SB09-149 on the BK target, while drill hole SB09-161, located on the Alhambra structure, intersected a 7-metre wide alteration zone containing 50 per cent quartz veins with assays of 6.45 and 6.96 grams per tonne gold over 3.0 and 1.5 metres, respectively (Beacon Hill Consultants (1988) Ltd. (2012-10-15): Preliminary Economic Assessment on the Bralorne Gold Mines Property).

In a June 2009 Technical Report on Bralorne Pioneer Mine Property updated resources were 17,627 tonnes measured grading 16.24 grams per tonne Au and 142,330 tonnes inferred grading 14.98 grams per tonne Au calculated at 7.78 grams per tonne Au cut-off(Technical Report June 2009 p.56, http://www.bralorne.com).

In 2010, a trial stope was prepared on the BK-800 shoot by constructing a by-pass drift and draw points (222 metres). Shrinkage stoping of the BK800 followed and continued throughout the year. A total of 5645 tonnes grading 11.31 grams per tonne gold was extracted and stockpiled (Beacon Hill Consultants (1988) Ltd. (2012-10-15): Preliminary Economic Assessment on the Bralorne Gold Mines Property).

Exploration development was also done on the North vein following a review of historic non-compliant resources that reveled a potential block of mineralization. The North vein development consisted of a footwall access drift and sublevels along the vein (813 meters) plus raises (490 metres) to determine the extent of the mineralized zone. Trial mining then followed using a modified room and pillar method. A total of 3687 tonnes grading 14.50 grams per tonne gold was extracted and stockpiled (Beacon Hill Consultants (1988) Ltd. (2012-10-15): Preliminary Economic Assessment on the Bralorne Gold Mines Property).

Also at this time, a total of 2,712 metres in 11 holes was drilled, resulting in a number of significant intercepts and delineation of a new mineralized shoot named BK-3. The best intercept yielded 140.46 grams per tonne gold over 0.6 metres in hole SB10-169 (Beacon Hill Consultants (1988) Ltd. (2012-10-15): Preliminary Economic Assessment on the Bralorne Gold Mines Property).

In April 2011, production was commenced with trial mining being performed on the North and BK-800 mineralized areas. Total gold production at the end of December was estimated at 101.04 kilograms from a total of 13,904 tonnes (dry) that had been milled, with an average feed grade of 8.7 grams per tonne gold and a recovery of 91 per cent (Beacon Hill Consultants (1988) Ltd. (2012-10-15): Preliminary Economic Assessment on the Bralorne Gold Mines Property).

Also at this time, underground development resumed in the BK decline, with the target redefined as the BK-3 zone. Surface and underground drilling, totalling 5012.4 metres in 30 holes, was also done in 2011, targeting the BK-3 zone (BK vein) and the BK North and BK South veins. Drilling highlights include intercepts on the BK zone of 5.1, 12.6 and 22.9 grams per tonne gold over 5.2, 1.8 and 0.5 metres in holes SB11-028, -006 and -013, respectively, while drilling on the BK North vein yielded up to 93.4 grams per tonne gold over 0.6 metres in hole SB11-001 (Beacon Hill Consultants (1988) Ltd. (2012-10-15): Preliminary Economic Assessment on the Bralorne Gold Mines Property). Another drill hole intercept (hole SB11-021) on a target referred to as ‘New Find’ yielded 800.6 grams per tonne gold (1765.0 grams per tonne gold on re-assay) over an interval of 0.9 metre (0.5 metre true width; Beacon Hill Consultants (1988) Ltd. (2012-10-15): Preliminary Economic Assessment on the Bralorne Gold Mines Property). The new structure has been named the M-vein.

Also in 2011 and early 2012, underground diamond drilling, totalling 2815.7 metres in 20 holes, were completed. Drilling highlights included 226.00, 385.57 and 24.99 grams per tonne gold over core intervals of 0.4, 2.1 and 0.6 metres in holes UB11-002, UB12-015 and again in UB12-015 on the BK North, BK and New Find (M) veins, respectively (Beacon Hill Consultants (1988) Ltd. (2012-10-15): Preliminary Economic Assessment on the Bralorne Gold Mines Property).

In 2012, underground development focused on the BK-3 area with sub-levels being developed along the structure at the 3700, 3800 and 3900 elevations. The levels were subsequently connected by raises. This work identified that the BK zone was made up of three major structures, the BK, the BK-9870 and the BK-9790 (Alhambra) structures.

In August 2012, an updated resource estimate for the Bralorne mine was reported at 154,750 tonnes measured and indicated grading 9.11 grams per tonne gold with an additional 246,835 tonnes inferred grading 8.78 grams per tonne gold (Beacon Hill Consultants (1988) Ltd. (2012-10-15): Preliminary Economic Assessment on the Bralorne Gold Mines Property).

At the end of December 2012, total gold production was estimated at 181.58 kilograms from a total of 26,332 tonnes (dry) milled with an average feed grade of 8.9 grams per tonne gold and a recovery of 87.8 per cent (Kirkham, G. (2016-10-20): NI 43-101 Technical Report – Bralorne Gold Mine).

In 2013, underground development continued in the BK Mine, with 187.6 meters of sublevel development along the 3700, 3770, 3800, 3900 and 3930 elevations. Stope development preparation was carried out on the 3700 and 3770 levels with 130 meters of extraction drifts and drawpoints. A total of 267.1 meters of exploration raises were completed joining the sublevels of the BK Mine. Also at this time, underground drilling was carried out with a total of 734.42 metres being drilled from ten holes.

At the end of December 2013, total gold production was estimated at 96.30 kilograms from a total of 27,489 tonnes (dry) milled with an average feed grade of 4.2 grams per tonne gold and a recovery of 78.3 per cent (Kirkham, G. (2016-10-20): NI 43-101 Technical Report – Bralorne Gold Mine).

In 2014 Avino Silver & Gold Mines acquired the property. Underground development focused on further developing the Alhambra and BK9870 veins in the BK Mine by drifting and raising on all three levels. Stopes were developed on the Alhambra Vein (BK3700-6180E-Stope), the BK Vein (BK3700-6360E-Stope, BK3700-6390E-Stope), and the BK-9870 Vein (BK3700-6085E-Stope, BK3800-6255E-Stope, BK3800-6360E-Stope, and BK3900-5850E-Stope).

In December 2014, the company put the mine on care and maintenance because the tailings storage facility had reached capacity. Also at this time, a diamond drill program comprising 1054.3 metres in 10 holes was conducted on the Shaft and Prince veins. Drilling highlights include intercepts of 41.00, 10.25 and 87.84 grams per tonne gold over core lengths of 0.5, 2.4 and 0.3 metres (0.4, 2.2 and 0.2 metres true width) in holes SB14-002, -003 and -008, respectively on the Shaft vein and 26.96 grams per tonne gold over a core length of 1.1 metres (0.9 metres true width) in hole SB14-001 on the Prince vein (Kirkham, G. (2016-10-20): NI 43-101 Technical Report – Bralorne Gold Mine).

Total production, in 2014, was estimated at 145.26 kilograms from a total of 32,181 tonnes (dry) milled with an average feed grade of 5.9 grams per tonne gold and a recovery of 83.5 per cent (Kirkham, G. (2016-10-20): NI 43-101 Technical Report – Bralorne Gold Mine).

In 2015, the focus of the underground development was initially to advance the BK Mine 3750 and 3850 Level access drifts towards the Alhambra Vein. Three drill holes targeted the Alhambra Vein extensions to the West for a total of 371.25 metres followed by drilling of 20 holes on the 77 and 52 Veins in the Gap zone between the historic Bralorne and Pioneer Mines totalling 6,202.98 metres of drilling. Further work in 2015 and 2016 had focused on the TSF embankment raise, subsequent buttressing, and mine plan development as well as permitting. Drilling highlights include intercepts of 17.45 grams per tonne gold over a core length of 0.3 metres (0.2 metres true width) in hole SB15-001 on the Alhambra vein, 13.01 grams per tonne gold over a core length of 1.7 metres (1.1 metres true width) in hole SB15-011 on the 52 vein and 21.53 grams per tonne gold over a core length of 1.7 metres (1.5 metre true width) in hole SB15-020 on the 77 vein (Kirkham, G. (2016-10-20): NI 43-101 Technical Report – Bralorne Gold Mine).

In October 2016, an updated resource estimate for the Bralorne mine was reported at 247,773 tonnes (273,123 tons) measured and indicated grading 11.3 grams per tonne gold (0.33 ounces per ton gold) with an additional 329,786 tonnes (363,527 tons) inferred grading 7.5 grams per tonne gold (0.22 ounces per ton gold; Kirkham, G. (2016-10-20): NI 43-101 Technical Report – Bralorne Gold Mine).

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