The Black Diamond showing is located on Jacob's Creek, 30 kilometres north of Alice Arm. A sparsely mineralized quartz vein was explored by trenching and tunnelling in 1918 and 1922.

The showing consists of a quartz-breccia vein, up to 4.9 metres wide, striking 130 degrees and dipping steeply to the west. The vein is hosted in flat lying, northwest striking Middle-Upper Jurassic Hazelton Group argillite. The footwall contains 3.0 to 3.7 metres of quartz and brecciated argillite and the hangingwall is composed of banded quartz and argillite. Quartz stringers, exposed in an adit just below the outcrop, displayed specks of argentite. One of these stringers reportedly assayed up to 2057 grams per tonne silver (Minister of Mines Annual Report 1922, page 58). The adit is located 46 metres up the creek from a cabin (ca. 1922) and at about the same elevation. The adit has been driven a distance of 24 metres on a bearing of 345 degrees.

During 2010 through 2019, Dolly Silver Corporation explored the area as apart of the Dolly Varden property. A complete property exploration history can be found at the Dolly Varden (MINFILE 103P 188) occurrence.