Download or read book Statistical Analysis of Assay Data from the Round Mountain Silver Prospect, Custer County, Colo written by George S. Koch and published by . This book was released on 1971 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: A statistical analysis of silver assay data from rotary-drill-hole cuttings and diamond-drill-hole cores from the Round Mountain prospect, Custer County, Colo., demonstrates several useful methods for estimating grades and tonnages of ore from the drilling of wide-spaced holes in disseminated deposits of precious metals. A new method of ore appraisal is introduced which estimates grade and tonnage of ore by calculating convex hulls (smallest convex polygons) for sample points with assay values above specified cutoff grades.