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Autor:
Joanes Muda, W.K. Fletcher
Publikováno v:
Geochemistry: Exploration, Environment, Analysis. 5:211-214
The distribution of Au has been investigated under tropical rainforest conditions in an Au-rich tributary of the Sungai Kuamut, Sabah, Malaysia. Paired high- and low-energy sediment samples were collected, before disturbance by logging, from gravel a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7267187b6a19d284ba09b59fae26627b
https://doi.org/10.1144/1467-7873/03-036
https://doi.org/10.1144/1467-7873/03-036
Autor:
W.K. Fletcher, Joanes Muda
Publikováno v:
Journal of Geochemical Exploration. 67:211-222
Stream sediment geochemical surveys are well-suited to mineral exploration in tropical rainforests. However, there is evidence that watershed disturbance can increase sediment loads and thereby dilute or even eliminate geochemical anomalies that, und
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::de4b9d9013048475aad5c67574860028
https://doi.org/10.1016/s0375-6742(99)00052-7
https://doi.org/10.1016/s0375-6742(99)00052-7
Autor:
Germano Melo, W.K. Fletcher
Publikováno v:
Journal of Geochemical Exploration. 67:235-243
A stream sediment orientation survey was carried out for gold mineralization in the semi-arid northeast of Brazil. Eleven stations were sampled in duplicate along a 3000-m stream. The stream is ∼1.5 m wide at the upper station and ∼8 m wide at th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ab08b8500aa55b9069e5d070ae010a21
https://doi.org/10.1016/s0375-6742(99)00053-9
https://doi.org/10.1016/s0375-6742(99)00053-9
Autor:
T Christie, W.K. Fletcher
Publikováno v:
Journal of Geochemical Exploration. 67:201-210
Although it is well established that background geochemical patterns in stream sediments generally depend on drainage basin geology, little is known of the effects of watershed disturbance on such patterns. Here we report on the effects of forestry a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::985eaf490e5e397317b75966d8b21ba7
https://doi.org/10.1016/s0375-6742(99)00051-5
https://doi.org/10.1016/s0375-6742(99)00051-5
Autor:
T.A Delaney, W.K. Fletcher
Publikováno v:
Journal of Geochemical Exploration. 66:229-239
Cyanidation allows gold to be extracted from larger samples than is practical by fire assay and may thus provide both a simpler analytical procedure and better sample representativity. Here we compare recovery of gold by cyanidation and fire assay fo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::94c8d411f09bb71d168216644bfdac0e
https://doi.org/10.1016/s0375-6742(99)00007-2
https://doi.org/10.1016/s0375-6742(99)00007-2
Autor:
Z. Hou, W.K. Fletcher
Publikováno v:
Journal of Geochemical Exploration. 57:21-30
Harris Creek is a Au-rich, cobble-gravel bed stream in southern British Columbia, Canada. A preliminary study, based on analysis of 3.2) from bulk sediment samples, identified accumulations of Au at breaks-in-slope of the stream gradient. This is con
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3976bac864b2c8e4c9bb6b505b925c97
https://doi.org/10.1016/s0375-6742(96)00013-1
https://doi.org/10.1016/s0375-6742(96)00013-1
Autor:
C.H. Loh, W.K. Fletcher
Publikováno v:
Journal of Geochemical Exploration. 57:9-20
It is generally supposed that accumulations of heavy minerals develop on stream beds because heavy minerals are transported more slowly than the sediment as a whole. However, insofar as relative transport rates of heavy minerals and sediments have no
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::846aef535bd17e341c06c082bae46166
https://doi.org/10.1016/s0375-6742(96)00012-x
https://doi.org/10.1016/s0375-6742(96)00012-x
Autor:
W.K. Fletcher
Publikováno v:
Journal of Geochemical Exploration. 57:31-43
Compared with the rain forests of the old shield areas of West Africa and the Amazon Basin, the rain forests of SE Asia are characterized by high relief, active tectonism and volcanism. These features, together with heavy tropical rains, result in th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7e8ae52b5d99ffaaab078957d4a4e0cf
https://doi.org/10.1016/s0375-6742(96)00014-3
https://doi.org/10.1016/s0375-6742(96)00014-3
Autor:
C.H. Loh, W.K. Fletcher
Publikováno v:
Journal of Geochemical Exploration. 56:47-57
Accumulation of heavy minerals, such as gold and cassiterite, on stream beds is a well-known phenomenon that results from differences in the rates of transport of the heavy minerals and the sediment as a whole. These accumulations can be both an adva
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6118b89abcb4f376a719f8f565425652
https://doi.org/10.1016/0375-6742(95)00049-6
https://doi.org/10.1016/0375-6742(95)00049-6