Identifier: geologyofgoldfie00harr (find matches)
Title: The geology of the goldfields of British Guiana
Year: 1908 (1900s)
Authors: Harrison, John Burchmore, 1856-1928 Fowler, Frank Anderson, Charles Wilgress
Subjects: Gold mines and mining Geology Petrology
Publisher: (London) Dulau & Co.
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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ofconcretionary ironstone. The landing for the Groete Creek path is situated on the left bankof the Cuyuni River about three-quarters of a mile below Tiger Island.As already described, this path traverses a country of epidiorite andhornblende-schists. Probably the Oko Hills, which appear to be acontinuation of the Blue Mountain Range on the right bank of theCuyuni, consist of hornblende-schist and amphibolite similar to thoseexposed on the path. The only rock seen in the Mariwa Channel between the left bankof the river and Tiger Island, is a mass of white quaitz. Assays showedthat it contains only traces of gold. The Government Station is situated alxtut half a mile above TigerIsland on the right bank of the river. It stands on a hill about sixtyfeet high, the top of which is covered with a red earth with abundantironstone-gravel, which in places contains large masses of milky-white(juartz. The slope of the hill from the river consists of a white friable \To fnc page 122. ; Platk 13.
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PORTAGING THE BOAT AROUND MATOPE CATARACT, OVEK GNEISS INTEKSECTF.l) IIV I.LVANS OF ATLITE, CUYUNI RIVER. Photo by C. W. Anien^on. The Lorver Essequibo River and Cuyuni River District. 123 sericite-schist. Colours of gold can Ije obtained from the earth on thishill ))j washing, whilst near by placers are being worked in alluvialdeposits derived from the sericite-schist. The rocks exposed on the series of isJaiirls in the channels betweenwhich the Arawak Matope, Kumaka, and Mariwa Cataracts occur,are mainly gneissose granitites passing to granitite-gneiss. Near the highest parts of the Portage at Arawak Matope, therocks are dark-colf)ured and compact, and consist of hornblende-schistof spf^eific gravity 2-89. The lower parts of the rocks, which are dark-greenish-grey in colour and have a greasy feel, show schistosity to amore marked extent, the planes being in some places approximatelyparallel to one another, in others crumpled into minute folds. Therocks are traversed by thin veins of

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