 | | | | COMMUNICATIONS CONSULTANTS Founder, Chairman, and Chief Executive Officer: Donald Brobst had a thirty-year...interests to education. Author of more than President and Chief Operating Officer: Judith A. McHale President...television programming, interactive media, books, films, and consumer products. DISCOVERY NETWORKS, a division...Communications, Inc., operates and manages the Discovery Channel, TLC, Animal Planet, and Travel Channel. Copyright...Communications, Inc. All rights reserved under International and Pan-American Copyright Conventions. Published in |  | | Report (issue) | | Mineral Resource Report 72 1977 ZINC AND LEAD OCCURRENCES IN PENNSYLVANIA Robert C. Smith, II COMMONWEALTH...TOPOGRAPHIC AND GEOLOGIC SURVEY Arthur A. Socolow, State Geologist Mineral Resource Report 72 ZINC AND LEAD...Photograph of 1852 lithograph showingthe Ecton, "Whim" and "new" Perkiomen mines(left to right, from the east)...comprehensive, up-to-date summary of the known zinc and lead occurrences in Pennsylvania in cluding an...classic report published by the Bureau of Topographic and Geologic Survey in 1924. During the 50 years since |  | | Report (issue) | | Contents Page Abstract Introduction General geography and geology Sedimentary rocks Intrusive rocks Glacial...deposits History and production Occurrence and character Mineralogy Tenor Origin and geologic distribution...distribution Mines and prospects Betty Mae Blue Bird and Mr.;:be Diamond John Fisher Creek Golden West Mining...of rugged mountains, composed chiefly of folded and faulted sedimentary rocks of the Belt series. In...nearby region the beds are intruded by diorite sills and granitic stocks. Glacial drift, including silt deposited |
|
