The Copper Island occurrence is located on the southwest corner of Copper Island, Atlin Lake. Upper Triassic Stuhini Group red and green olivine basalts and basaltic tuffs underlie the occurrence.

Native copper, malachite, and rare cuprite and tenorite occur in a number of calcite veins of a few millimetres up to 15 centimetres thick and as disseminations in basalt. The country rock is slightly mineralized with native copper near these small calcite veins as well. Masses of native copper, up to several pounds, have been reported.

In 1899, native copper was discovered on the southern shore of Copper (Goat) Island; 14 claims, including the Noel claim, were staked on the showings. The Laverdiere brothers staked several claims on the showings as well; these claims lapsed in 1910. Development work was done in an open cut 9 metres long with a face 3.7 to 4.6 metres high, which exposes a calcite vein about 20 centimetres wide containing a streak of native copper.