Placer Gold Deposits of New Mexico - Geological Survey Bulletin No. 1348 Trade paperback - 1980

A Del Oeste Press Quality Reprint, 1980. Trade Paperback. Fine. 5 1/2" x 8 1/2. 46 Pages.A 1980 Reprint of the 1972 Edition. Minor rubbing to small area on back cover. No marks or stamps. Interior text pages are faultless. Includes a 21' c 24' Laid -In Index Map in New Condition of New Mexico placer gold production. Two Tables: New Mexico placer gold poroduction, and Major gold districts in New Mexico . Thirty-three placer districts in New Mexico are estimated to have produced a minimum of 661,000 ounces of placer gold from 1828 to 1968. The location, areal extent, past production, mining history, and probable lode source of each district are summarized from a wide variety of published reports relating to placer deposits. An annotated bibliography of all reports that give information about individual deposits is given for each district. Most placer gold deposits in New Mexico are derived from gold-bearing mineralized areas in Tertiary intrusive rocks, and occur in gravels of alluvial fans, gulches, and rivers adjacent to the source. A few deposits are derived from gold-bearing Pre-cambrian crystalline or Tertiary volcanic rocks. Most of the major placer districts were discovered and extensively worked between 1828 and 1880; in later years, large-scale dredging operations were successful at a few localities, while intermittent activity continued at most districts