Portal de Periódicos da CAPES

Natural and Artificial Cements in Canada

1893; American Association for the Advancement of Science; Volume: ns-21; Issue: 530 Linguagem: Inglês

10.1126/science.ns-21.530.177

1095-9203

H. P. H. Brumell,

Tunneling and Rock Mechanics

and northeastern part of the hydrographic area of the Rio Bokay, also the placer mines of gold along tributaries of the W y l a m a ~, Attawas, Laccos, and Nagawas Creeks and the Rio Washpook have all heen eroded and transported by currents of water from the lateral moraine (about 60 miles long and 300 to 1000 feet altitude above the level of the valleys) that extends northeastwardly from the Barbar Mountains (the easterly ternninati )n of the Matagalpa system of mountains) to the Rio Washpook; and on the southeastern sideof this series of tern~inal and lateral moraines are the placer mines, also quite rich in gold, discovered in 1889 at Principullra.P S --Smse writing the above an opportunity occurred to paw Ghrough and hurriedly examine a part of " the placer " mines containing gold along one of the headwater confluents of Nagawas Creek rtrlbutary to Rio Wanque) and they gave such tesrilts from panning as to indicate much gold in the deposits, although no satisfactory estimate of thequantlty of gold in the cubic yard of' the gold-containing gravels was made because the examination mas hurriedly made and the "bed rock" on which the grhvel deposits rested was either not reached or not examined a t any place in that locality.These are drifts eroded and deposited by floods from the Glacial Epoch lateral and terminal moraines in that region.