The Black Diamond (North) occurrence is located 2 kilometres north of Ruby Mountain and around 22 kilometres northeast of the community of Atlin. It is about 1.4 kilometres south of the Adanac porphyry molybdenum deposit (104N 052).

The Black Diamond prospect is hosted within, and very near the southern margin of, the Mount Leonard Boss; a small stock removed from the main body of the Late Cretaceous Surprise Lake batholith (Surprise Lake Plutonic Suite). The batholith covers 1100 square kilometres east and northeast of Atlin and is dated at 70.6 +/- 3.8 Ma (Map 52). The occurrence is hosted in grey to pink, equigranular, coarse-grained quartz monzonite. The rock contains roughly equal amounts of potassium feldspar, plagioclase, and grey quartz. The showing lies very near the southern margin of the stock where it is in contact with metavolcanic and metasedimentary rocks of the Upper Paleozoic Cache Creek Complex.

The occurrence consists of a quartz vein which strikes northeast and dips 60 degrees to the northwest; it has been traced for about 4 kilometres. The vein contains disseminated patches or blebs of wolframite and arsenopyrite with minor muscovite, chalcopyrite, scheelite, molybdenite, cassiterite, fluorite and gold. The uranium oxide, zeunerite, has been reported to occur in the vein (Map 52).

The occurrence was discovered in 1903 and received the most exploration and development work from 1939 to 1943, and from 1951 to 1952. Although a small ore shipment was made in 1943, the deposit was never put into full production. No assay data is available from the work done.

In 1985, Cominco Ltd. released the property and it was then acquired by Cream Silver Mines Ltd. who carried out only minor surface work on the vein.

In 1985, geological mapping and geochemical sampling (soil and rock chip or grab samples) were conducted by Archean Engineering Limited on behalf of Mark Management Limited on the Ruby Mountain Silver-Tungsten Property.

In 1987, a detailed exploration program consisting of rock and soil geochemical sampling, electomagnetometer, induced polarization and ground magnetometer surveys followed by trenching, blasting, diamond and rotary drilling was carried out on the Lakeview property by Archean Engineering Limited on behalf of Cream Silver Mines Limited.

In 2002, geological, geochemical and geophysical fieldwork was carried out on the Adanac Property for Stirrup Creek Gold Inc.

From 2006 to 2008, Adanac Molybdenum Corporation conducted diamond-drilling on the Adanac/Ruby Creek "porphyry molybdenum" property, near Atlin.

In 2016, two holes were drilled by Global Drilling Solutions on behalf of Zinex Mining Corporation on the Ruby Creek Property, targeting native gold. In 2017, Global conducted geochemical sampling, drilling and ground geophysics on this property. In 2018 Global carried out further geochemical sampling and drilling on this property.

In 2021, an airborne SkyTEM survey was conducted by Stuhini Exploration on the Ruby Creek property, which revealed a number of regional trends across the property.