The deposit was discovered in 1914. Exploration before 1952 included a 15-foot shaft, a 44-foot shaft, drifts totalling 100 feet, and several trenches (Sainsbury, 1957). Maas and others (1995, p. 277) report a third shaft, of unknown length. Samples across about 3 feet of the main vein contained 25.67-48.86% Sb, Read more [...]
THE TOFTY CARBONATITE IN CENTRAL ALASKA IS AN UNDEREXPLORED NIOBIUM AND REE BEARING INTRUSIVE SILL UP TO 30 METERS THICK AND OVER 35 KILOMETERS IN STRIKE LENGTH. LIMITED DRILLING AND TRENCHING ON A VERY NARROW CORRIDOR ALONG THE EXPOSED SILL HAS CONFIRMED THE PRESENCE OF CRITICAL MINERAL CONCENTRATIONS, THOUGH NO Read more [...]
