The Amber occurrence is located on Hercules Creek on the southeast corner of the historic Last Chance #1 claim. We have assumed that the occurrence on the Last Chance claim and the Amber (Westmin/D. Alldrick) are the same. Exact location is uncertain, but the showing is in the area and there has been mineralization identified at this location.

Located in the Intermontane Belt, the area, bounded on the west by the Coast Crystalline Complex and on the east by the Bowser Basin, is part of the volcanic arc assemblage of the Stikinia Terrane.

The mineralization is hosted by the Upper Triassic to Lower Jurassic Hazelton Group, Unuk River Formation metavolcanics. The Hazelton Group is a northwest trending steeply east dipping belt of folded andesitic lapilli tuffs, flows and breccia containing a thick sequence of argillite and siltstone infolded along a synclinal axis. The sequence is intruded by the Early Jurassic Texas Creek plutonic suite of dacitic porphyry dykes and sills.

Silicified zones within andesitic tuffs are mineralized with pyrite and minor sphalerite, galena and chalcopyrite. The zones appear to follow northeast striking, 50-to 60-degree northwest dipping shear zones which also contain quartz and calcite stringers with pyrite, galena and sphalerite.

These silicified zones are exposed in at least six opencuts and an adit, varying in elevation from 975 to 1021 metres over an area of approximately 182 metres. A sample across 1.52 metres of the best mineralization exposed, assayed 0.69 grams per tonne gold and 20.57 grams per tonne silver (Ministry of Mines Annual Report 1935-B6).

Work History

The Silver Basin group was owned and prospected by the Fitzgerald Brothers, of Hyder, Alaska, from about 1929 to about 1935. Most 6-metre long adit driven north 64 degrees east.

Mineralization was reported in 1929 the Silver Basin claim. See Silver Basin (104B 040).

In 1935, the Silver Basin Group included the Last Chance claim where newer work had occurred, apparently since 1929. The location is not well understood.

An airborne geophysical survey was carried out over the area on behalf of Atna Mines in 1969 (Assessment Report 2320). This included the Amber area.

In 1991, Westmin Resources had an airborne magnetic and electromagnetic survey conducted over the Premier Gold property totalling 760 kilometres (Assessment Report 21993). This survey covered an extensive area from the south end near the Premier mine area, north to the Yellowstone (104B 039) area. The area includes the Amber-Silver Basin area.

See also Yellowstone (104B 039) and Premier (104B 054) for related details of the Dilworth and Premier properties that were held as a single entity in the late 2000s by Boliden and Ascot Resources. Also see Big Missouri (104B 046) for historical work in the immediate vicinity of the Amber.