The Black Diamond occurrence is located on the west side of Boulder Creek near the Boulder Creek dam, about 20 kilometres northeast of the community of Atlin.
The showing is located within the southernmost zone of the Mount Leonard Boss, a small stock removed from the main body of the Late Cretaceous Surprise Lake batholith (Surprise Lake Plutonic Suite) which covers approximately 1100 square kilometres east and northeast of Atlin. The stock is composed of a fine to coarse-grained quartz monzonite (alaskite) which is occasionally feldspar porphyritic. The intrusion is often kaolinitized near mineralized quartz veins. The pluton has intruded into mafic volcanic, ultramafic, and sedimentary rocks of the Upper Paleozoic Cache Creek Complex which is exposed about 1 kilometre south of the occurrence.
The main vein of the Garnet occurrence is comprised of dark smokey quartz, strikes 030 degrees and dips 60 degrees to the northwest. The vein varies from 2 to 10 metres in width and has been traced for about 80 metres. Light grey, porphyritic felsic dikes occur both in the immediate footwall of the vein and about 16 metres west of the vein. Mineralization comprises patchy and erratic wolframite, ferberite, and rare gold. Sulphide mineralization is minor and is composed of pyrite, chalcopyrite, molybdenite, tetrahedrite and galena.
In 2002, a 0.3-metre rock chip sample (BD-AR-6) from a quartz vein with pyrite, chalcopyrite, galena, arsenopyrite and strong jarosite alteration analyzed 13.1 grams per tonne gold, 178.1 grams per tonne silver and 0.18 per cent copper (Assessment Report 26895).
In 1903, the first work done on the property was during the Atlin Gold Rush. An opencut was dug on the vein on the Black Diamond ground, and a 2.4-metre shaft was sunk on the vein on the North showing.
In 1939, The Consolidated Mining and Smelting Company of Canada Limited, while placer mining on Boulder Creek, found wolframite with the placer gold in the sluice boxes. The old workings were then examined, and wolframite and ferberite were discovered in the quartz veins. The Black Diamond group of claims were located in 1939 by MacLeod White, who was superintendent for the company. Surface stripping and trenching were done in 1939-41 on three showings, which were named the South, the North, and the Wolframite. The South showing is on ground now forming part of the Black Diamond group. The North showing (104N 054) is 2.4 kilometres to the northeast at an elevation of 1585 metres, and the Wolframite (104N 006) is 2.4 kilometres to the north of the Black Diamond group at an elevation of 1768 metres. In 1941, 20 samples taken by Cominco over a length of 70 metres and average width of 3 metres averaged 0.60 per cent tungsten. In 1942, Fisher and Olsen leased the Boulder Creek Placers from the Consolidated Company. Some further stripping and trenching were done on the South vein, and in 1943 a small shipment of cobbed ore was sent to the Prince Rupert Sampling Plant. In 1943, a shipment made from this vein yielded 15.2 per cent tungsten oxide and 10.6 grams per tonne gold; this material was likely selective high-grade (Minister of Mines Annual Report 1950). In 1949, a quantity of black sand concentrate from the placer clean up was re-concentrated in Atlin and yielded 2.7 tonnes of cleaned concentrate that was shipped to Derby and Co., Ltd., of London, England. The shipment included coarse concentrates that weighed approximately 589 kilograms, and fine concentrates that weighed approximately 2132 kilograms. The coarse concentrates assayed: tungstic oxide, 46.88 per cent; tin, 7.42 per cent. The fine sands assayed: tungstic oxide, 49.01 per cent; tin, 10.75 per cent. The tungsten minerals recovered in the placer operation come from broken-down vein matter and are concentrated on the bedrock by stream action. The source of the tin is not known. It may have been a constituent of the igneous rocks of the area or of the veins or stringers of quartz.
In 1993, a ground magnetometer and VLF-EM survey along 4 kilometres of grid was conducted on the BOCR claim on behalf of owner, M. Sherman.
In 2002, Stirrup Creek Gold Ltd. conducted exploration on the Black Diamond and Silver Diamond (104N 069) areas. A total of 28 rock chip, 142 soil and 7 silt samples were taken in addition to geological mapping and 4.1 kilometres of ground magnetometer surveying.
Between July 2007 and March 2008, Adanac Molybdenum Corporation conducted a major diamond drill-program on the Adanac/Ruby Creek "porphyry molybdenum" property, near Atlin (Assessment Report 30306).
In 2016, two holes were drilled by Global Drilling Solutions on behalf of Zinex Mining Corporation on the Ruby Creek Property, targeting native gold (Assessment Report 36658). In 2017, Global conducted geochemical sampling, drilling and ground geophysics on this property (Assessment Report 37171). In 2018 Global carried out further drilling, prospection, augering and geochemical sampling on this property. It’s mentioned that the Ruby Creek property remains of high interest for not only gold/molybdenum but also for silver and copper based on the exploration work during 2017/2018 (Assessment Report 38256).
In 2020, Stuhini Exploration conducted mapping, prospection, ground geophysics and geochemical sampling on the Ruby Creek property (Assessment Report 39374). In 2021, an airborne SkyTEM survey was conducted by Stuhini on this property, which revealed a number of regional trends across the property (Assessment Report 39553).
