The Zappa Toe occurrence is located on a middle ridge side approximately 5 kilometres south of Iskut River in northwest British Columbia, approximately 98 kilometres northwest of Stewart. It is located approximately 11 kilometres east-southeast of the past producing Snip mine (MINFILE 104B 250) and approximately 9 kilometres east-northeast of the past producing Johnny Mountain mine (MINFILE 104B 107).

The region, often referred to as the Bronson Corridor, is underlain by stratified rocks of the Upper Triassic Stuhini Group, Upper Triassic-Lower Jurassic Hazelton Group, and by early Jurassic plutons and smaller bodies that are considered co-magmatic with Hazelton group volcanic units. Stuhini Group rocks are unconformably overlain by rocks of the Hazelton Group, both of which are cut by plutons, plugs, and dikes of the Lehto suite (Assessment Report 35184).

At the Zappa Toe occurrence, rock units comprise Upper Triassic Stuhini group marine sedimentary and volcanic rocks. Rocks are described as a commonly brown to buff weathering sequence, consisting of well bedded to locally cross-bedded siltstones, sandstones, and coarse, immature volcanic wackes. Very minor calcareous interbeds have been noted (Assessment Report 35184).

In 2006 and 2007, Hathor Exploration Ltd. completed a 7228.7 line-kilometre airborne geophysical survey on the area as the Pac claims of the Iskut project. In 2008, Max Minerals Ltd. examined the property.

In 2014 Colorado Resources Ltd. discovered the Zappa Toe occurrence while exploring the larger KSP property. Soil sampling reported anomalous values of gold, silver, copper, and zinc. Sampling of 59 rocks indicated zinc dominated polymetallic mineralization hosted in quartz and quartz-carbonate veins and narrow breccia zones in silicified sedimentary rocks. Sample 1748161, taken from an 80 by 90 by 70 centimetre boulder with quartz-calcite-sulphide veining reported 10.1 per cent zinc, 0.159 per cent copper, 0.165 per cent lead, 31.1 grams per tonne silver, and 185 parts per billion gold. Sample 1724092, chips of a 7 centimetre wide quartz-chalcopyrite-sphalerite-galena-pyrite vein reported 36.7 grams per tonne gold, 74.9 grams per tonne silver, 0.578 per cent copper, 1.92 per cent lead, and 7.01 per cent zinc (Assessment Report 35184).

In 2017, Colorado Resources field crews collected 15 rock samples with 5 out of the 15 rock samples returning greater than 1 per cent Zn which are associated with elevated values for silver and gold (Assessment Report 37604).