The Led 74 showing area is underlain by Upper Triassic Nicola Group andesitic volcanic rocks which are intruded by small Tertiary? bodies of quartz diorite to quartz monzonite east of Gilbert Lake and northeast of Greenstone Mountain. The volcanics are commonly massive augite porphyry andesite interbedded with tuffaceous fragmentals and flow breccia.

There is an inclined shaft at the showing where chalcopyrite, bornite, malachite, azurite, specularite and pyrite occurs in a quartz-calcite vein in a shear zone. Minor chalcopyrite is disseminated in the wallrocks. The vein is up to 1.5 metres wide, strikes northeasterly and dips at 47 degrees to the southeast. A couple of metres to the southwest of the shaft, the vein is 15 to 30 centimetres wide, but in the area of the shaft and at a depth of 6 metres, it is 1.5 metres wide. The vein is obscured in both directions along strike by overburden. The vein cuts massive andesite that has been weakly chloritized and epidotized near the vein. It is estimated that the shaft is a minimum 15 metres deep. The size of the dump would indicate approximately 122 metres of underground workings (Assessment Report 4155).

The vein on the Led 74 claim was probably found in the early 1900s and worked in the 1930s. In 1972, Avino Mines and Resources Ltd. and Moneta Porcupine Mines Ltd. established 8.9 kilometres of grid and conducted geological mapping, soil sampling (1000), road building (305 metres) and 91 metres of trenching on the Led-Ex claims. In 1973, Moneta Porcupine Mines Ltd. continued work on the Led-Ex claims and completed geological mapping and soil sampling (236).