The Gridiron adit is located about 9 metres above the western shore of Bennett Lake on a west-trending shear zone.

The shear zone occurs in rock of the Devonian to Middle Triassic Boundary Ranges Metamorphic Suite near the contact margins of the Coast Plutonic Complex and the Intermontane Belt. These rocks comprise chlorite feldspar gneiss, schist, marble and hornfels feldspar porphyry. The east-west trending adit follows a crushed zone of quartz and talcose matter carrying several per cent galena, tetrahedrite, arsenopyrite, pyrite and minor sphalerite.

A clearly defined quartz vein, about 0.2 metres wide, near the adit portal, was reported (1901) to carry high gold and silver values. In 1901, 68 tonnes of ore were mined producing 2582 grams of silver and 156 grams of gold. A sample of the quartz vein taken in 1982 assayed 3.2 grams per tonne gold, 315 grams per tonne silver, 2.05 per cent lead and 1.34 per cent arsenic (Assessment Report 10425).

This property is located on the west side of Bennett Lake, about 9.7 kilometres from the town of Bennett. Four unsurveyed claims were owned by Messrs. Whitefield and Hildebrand. Development work, done around 1901, consists of a 34-metre-long adit driven from a point approximately 9 metres above the lake level.

In 1981, the Ange 1 and 2 claims were staked by Du Pont Canada Exploration on the basis of a gold rich soil sample taken from the workings. Follow up work consisted of both soil and rock sampling. A total of 27 soil -, 6 rock - and 1 stream sediment samples were collected during 1981. Evidence of an old working lies along the lake east of ANGE 1 within the BE 1 claim. Soil sampling was carried out on a 25-metre spacing along the higher slopes of ANGE 1. Rock samples were collected at random sites throughout the property A lack of stream sediments due to the steep gradients of the creeks prevented further sampling of this nature.

See Rohan (104M 111) for related work in the area.