The Cleagh occurrence is located on an un-named southerly flowing tributary of Mahatta Creek, approximately 2 kilometres west of Kewquodie Creek.

The area lies within the Insular Belt of the Cordillera and is underlain mainly by volcanics, crystalline rocks and minor sediments. Andesitic to rhyodacitic lava, tuff and breccia of the Lower Jurassic Bonanza Group overlie an assemblage consisting of Paleozoic Sicker Group sediments and Upper Triassic Vancouver Group basalts and minor carbonate and clastic sediments.

The Bonanza volcanics are coeval with, or genetically related to, granodiorite stocks of the Jurassic Island Plutonic Suite which intrude all older rocks.

Mineralization consists of chalcopyrite-molybdenum-sphalerite in quartz veins at the contact between basic lavas and felsic breccia, both of the Bonanza Group. A small (1 kilometre diameter) granitoid stock lies 1.7 kilometres to the northeast.

Work History

In 1969 and 1970, Skaist Mines completed programs of geological mapping, geochemical sampling and geophysical surveys. In 1991, Stow Resources completed programs of prospecting, geological mapping and geochemical sampling on the Mahatta claims. During 2001 through 2006, the area was explored by S. Laurence and E. McCrossan as part of the Queen claims. Programs of prospecting, geological mapping and geochemical sampling were completed at this time. In 2014, Eden Venture Investments completed a minor program of prospecting and geochemical (rock and silt) sampling on the area as the Copper 1-4 claims of the Klootchlimmis Creek property.