The region of the Monday Crown Grant is underlain by the Lower Jurassic Elise Formation, Rossland Group comprised of banded horn- fels, grey to black siltstone, greenstone and a unit consisting of green volcanic conglomerate, breccia and sandstone. Augite porphyry (diorite) of the Rossland sill intrudes the upper part of the Elise Formation and occurs south and east of the Monday property. The southern edge of the Lower Jurassic Rossland monzonite is located approximately 100 metres north of the property. A stock of the Middle Jurassic Coryell Intrusion composed of syenite to monzonite and granite intrudes the strata a few hundred metres to the south.

The Monday vein system lies within the zone of thermal metamor- phism associated with the monzonite intrusive and is hosted by the banded hornfels. The ore associated with the Monday veins is classed as Transitional-type which is a gradational mineralogy and metal content between the Main vein-type and the South-belt type (Bulletin 74). Ore generally contains abundant sphalerite, minor galena, and is low in silver.

A shaft was sunk along a vein striking 056 degrees and dipping 75 degrees north. The vein hosts pyrrhotite, pyrite with minor chalcopyrite and crosscuts hornfels and monzonite. Other veins strike between north and 045 degrees and are hosted by hornfelsic siltstone. Mineralization consists of arsenopyrite, sphalerite, galena, pyrrhotite and pyrite.

In 1937, 64 tonnes of ore were mined from veins within the Monday claim from which was recovered 13,468 grams silver, 2,226 kilograms lead and 3,467 kilograms zinc.