Location: Central British Columbia (Omineca Mining Division)
Minerals: Au, Ag, Cu, Mo, Zn, Pb
Ownership: 100% Gray Rock
Size: 711.2 ha
Gray Rock’s Ootsa property is located approximately 33 km southwest of Fraser Lake and 160 km northwest of Prince George in Central British Columbia approximately 40 Km south of Gray Rock’s Ootsa property. Other notable projects in the area include Centerra Gold’s Endako Mine which lies 60 Km to the north and New Gold’s Blackwater project located approximately 40 Km to the south. The property is attractively located and is near infrastructure, the terrain is characterized by rolling hills and is accessible by logging road and has access to low cost hydroelectric power.
In 1986 the Ootsa claim was owned and operated by Newmont Exploration of Canada Limited. Newmont Exploration collected 403 soil and 20 rock samples on the Ootsa in 1986‐1987. Soil samples were collected along grid lines every 25m, where possible, and the “B horizon”, where developed, was sampled at a depth between 10 cm and 20 cm.
During a regional prospecting program in the early 1990s a small fluorite occurrence was discovered in a new road cut just south of Lucas Lake. A few samples were taken from the fluorite showings at that time. The fluorite showings cover an area of about 200 meters by 100 meters and, considering the strong geochemistry of the area, an epithermal precious metals target is possible.
The primary geological target is epithermal veins, shear‐zone hosted gold deposits. “Epithermal” literally means “shallow heat”, and is applied to hydrothermal systems emplaced at shallow depths (<1 km) in the earth’s crust. “Low Sulfidation” refers to a style of epithermal system developed in a geothermal or hot springs environment. Gold and silver mineralization in low sulphidation epithermal vein deposit (“LSEVD”) systems occurs dominantly as veins and stockworks with minor disseminations. Low‐sulfidation deposits form from neutral‐pH, reduced (H2S‐rich) hydrothermal fluids similar to those encountered in geothermal systems with surface manifestation including silica sinter‐depositing hot springs and steam‐heated acid‐sulfate alteration.
Fluorite may occur as a vein deposit, especially with metallic minerals, where it often forms a part of the gangue (the surrounding “host‐rock” in which valuable minerals occur) and may be associated with galena, sphalerite, barite, quartz, and calcite. It is a common mineral in deposits of hydrothermal origin.