The ENIGMA stibnite vein/shear is exposed in a trench and in shoreline outcrop on the south shore of Carpenter Lake, about 8.5 kilometres east of Gold Bridge, B.C.

The vein is within brecciated ribbon chert of the Permian to Middle Jurassic Bridge River Complex. The vein is composed of quartz and orange-brown calcite, with up to 70 per cent of the vein occupied by bladed to massive stibnite, with small amounts of interstitial arsenopyrite. Minor fine-grained pyrite is present along vein margins. Both quartz and calcite are vuggy. Vein margins are sharp but not foliated. Red staining on vein material is probably kermesite (after stibnite). The Enigma vein is similar to veins of the Congress deposit (092JNE029).

The Kelvin and Olympic areas saw initial development in the mid 1930s and again in the mid 1940s with underground drifting plus some drilling on the Kelvin prospect. In 1980, Noranda Mines Ltd. undertook geological mapping, soil geochemical sampling and magnetometer surveying in the area. Big I Developments Ltd. conducted programs of geological mapping, grid soil geochemical sampling in the area in 1985, as well as extending southward with prospecting up Girl Creek (south of the Kelvin prospect) and up Howe (Marquis) Creek, south of the Enigma prospect.

Avino Mines and Resources Ltd. acquired the Minto property to the north of Carpenter Lake and the Olympic property south of the lake in 1987, and conducted programs of soil sampling, airborne VLF-EM and magnetometer survey, trenching and diamond drilling through to 2005. This included a trench and diamond drill hole on the Enigma. (Assessment Reports 17790, 27443). Samples from Enigma trench OT-23 assayed 1.7 grams per tonne gold over 21 metres, within a 75 metre wide mineralized zone. The drill hole at Enigma resulted in a 1 metre wide zone of 0.38 gram per tonne gold.

In 2022 and 2023, Endurance Gold Corp. conducted prospecting and geochemical orientation and sampling surveys on their Olympic property and on the Sanchez property to the east, as part of their Reliance Gold project. These surveys established parallel northwest trending targets across the Kelvin, Minto-Olympic and Enigma-Dauntless areas (Assessment Report 41676). In 2022, the high-grade gold-stibnite veins at the Enigma shoreline exposure were sampled in a 75 metre wide ankerite shear zone, returning values of 9.66 grams per tonne gold, 2.1 grams per tonne silver and 11.9 per cent antimony.