The Brass Rose nickel-cobalt occurrence consists of a series of carbonate veins and local semi-massive sulphides, hosted within intermediate volcanic rock. Mineralization is spatially associated with mafic dikes. Different textural relationships in outcrop may indicate multiple generations of mafic dikes.

Epidote, chlorite, and carbonate alteration is noted throughout the area. Mineralized veins and the lenses of semi-massive mineralization show very narrow alteration envelopes (5-20 centimetres); it remains unclear how much of the alteration is related to the mineralization at Brass Rose. This is the only occurrence of semi-massive pyrrhotite in the general area. The showing also contains minor amounts of chalcopyrite resulting in grades of 0.14 to 0.20 per cent copper (Assessment Report 39128). Carbonate veins trend approximately 040 degrees and host nickel-cobalt arsenides believed to be nickeline, cobaltite, and gersdorffite. These veins range from 10 to 50 centimetres in width, though a true vein density is difficult to establish due to talus cover.

In 2019, Crystal Lake Mining collected 2070 rock samples and 6125 hyperspectral measurements were collected throughout the Newmont Lake property, significantly in the Chachi Corridor). The area was also extensively covered by the property-wide soil sampling program. A total of 2624 soils samples were collected, with a main focus around the Chachi Corridor (including Brass Rose), Cuba, North/Kerr Glacier, and Thumper areas. In addition to geological and geochemical work, approximately 18-line kilometres of an Induced Polarization (IP) survey was completed along the northern portion of the west side of the Chachi corridor over known showings that included QS (104B 446), Tetra (104B 448), Chochi (104B 461), Tic 5 (104B 549), Leo (104B 717), Brass Rose (104B 723) and Grey Rose (104B 728).

The Brass Rose high-grade nickel-cobalt arsenide/sulphide showing occurs within dioritic phases of the Late Devonian Forest Kerr Pluton (McLymont Plutonic Suite). A sample assayed 7.7 per cent nickel, 0.81 per cent cobalt, 0.17 per cent copper, and 10.9 grams per tonne silver (Crystal Lake Mining Corp., News Release, Oct.10, 2019; Assessment Report 39128).

Crystal Lake reports that there is a general nickel-cobalt enrichment across a wide range of samples throughout the Chachi Corridor proximal to the IP conductivity/chargeability feature.

See Chochi (104B 461) for related details of a common work history and related geological information. Refer to Northwest (104B 281) for details of work on the greater Newmont Lake property. Also see Burgundy Ridge (104B 325) for related updates on the Newmont Lake property.