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Statistical analysis of assay data from the Round Mountain silver prospect, Custer County, Colorado.

Authors
Koch-GS Jr.
Source
NTIS: PB 198 268 :1-32
Link
NIOSHTIC No.
10008723
Abstract
A statistical analysis of silver assay data from rotary-drill-hole cuttings and diamond-drill-hole cores from the Round Mountain Prospect, Custer County, Colorado, 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. Analyses of variance compare the consistency of data from rotary- and diamond-drill holes, from rotary-drill holes sampled at 2- and 4-foot intervals, from two methods of sample preparation, and from atomic-absorption and fire assaying. Evidently, data from the two types of drill holes, from holes sampled at the two intervals, and from different methods of preparation are in agreement. Atomic- absorption silver values are consistently lower than fire-assay silver values. Work done in cooperation with Round Mountain Associates.
Publication Date
19710101
Document Type
IH; Report of Investigation;
Fiscal Year
1971
NTIS Accession No.
PB-198268
NTIS Price
A04
Identifying No.
RI 7486
NIOSH Division
DRC;
Source Name
NTIS: PB 198 268
State
CO;
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