The Flint mine is situated near the headwaters of Carlyle Creek between the two Flint lakes, in the Slocan Mining Division. The underground workings are at 2050 metres elevation above sea level.
This property was staked in 1898 and the first recorded production was in 1905. The Flint lode has been opened up by 3 crossscut adits driven in a westerly direction. The lowermost adit reaches the lode at 67 metres from the portal, and has been extended beyond the lode for 72 metres, to a point believed to be within 15 metres of the Granite King lode. The portal of No. 2 adit is located about 46 metres southwest of, and about 24 metres above the portal of the lowest adit, and the portal of the uppermost or No. 1 adit is 46 metres above and 152 metres southwest of this same portal. No. 2 adit reaches the lode at 15 metres, and the No. 1 at about 30 metres. At each adit level drifts have been run southerly along the lode for distances of 183, 85, 18 metres at levels 3, 2, and 1, respectively, and from near the face of No. 3 adit a raise extends to the surface.
In 1953, after remaining idle since about 1917, some work was done on the property, and a little ore taken out.
Regionally, the area lies on the western margin of the Kootenay Arc, in allochthonous rocks of the Quesnel Terrane. In the vicinity of the occurrence, the Quesnel Terrane is dominated by the Upper Triassic Slocan Group, a thick sequence of deformed and metamorphosed shale, argillite, siltstone, quartzite and minor limestone. Rocks of the Slocan Group are tightly and disharmonically folded. Early minor folds are tight to isoclinal with moderate east plunging, southeast inclined axial planes and younger folds are open, southwest plunging with subhorizontal axial planes. The sedimentary sequence has been regionally metamorphosed to lower greenschist facies.
The Slocan Group has been intruded by the Middle Jurassic Nelson intrusions which comprise at least six texturally and compositionally distinct phases ranging from diorite to lamprophyre. The most dominant phase is a medium to coarse grained potassium feldspar porphyritic granite (Paper 1989-5).
The occurrence consists of a brecciated quartz-siderite vein emplaced along a shear within porphyritic granite of the Nelson intrusions. The vein strikes 010 degrees, dips 60 degrees to the west and consists mostly of broken angular blocks of granite cemented by quartz and siderite. Minor tourmaline occurs disseminated within the quartz. The vein varies in width from a few centimetres up to 3.4 metres. Galena, sphalerite, pyrite, pyrrhotite and minor scheelite occur as disseminations within the quartz and as massive to banded pods, some up to 1 metre wide, concentrated along the hangingwall. Most of the high-grade ore was mined out in the early 1930s.
The vein has been explored with four adits and extensive drifting. The lowermost adit extends to the Granite King vein (082FNW082), 750 metres to the southwest.
A grab sample taken from the vein in the uppermost adit assayed 576 grams per tonne silver and 4.88 per cent tungsten but later sampling of the vein failed to duplicate the tungsten assay. However, scheelite was observed in the underground workings (Assessment Report 7950).
Production from the Flint vein between 1905 and 1985 yielded 360,491 grams of silver, 69,087 kilograms of lead, 6445 kilograms of zinc and 43 grams of gold from 177 tonnes mined.
