Alluvial heavy minerals
Stream sediment sampling, NTS 21N, 22C, Lower St. Lawrence region, Quebec, 1987.
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In 1987, in the Lower St. Lawrence region, heavy mineral preconcentrates were extracted from stream sediments by running about 250 kg of stream gravels through a portable suction dredge. A total of 728 samples were collected from as many sites from an area of approximately 8400 km2, resulting in an average density of one sample per 11.5 km2. Sample sites were generally chosen near the intersections of roads and small streams. Samples were collected several tens of metres upstream to avoid road contamination. The data are published in Geological Survey of Canada Open File 2036.
Paper report with data lists.
Heavy mineral concentrates analysed by INAA for Au + 20 elements; by AAS following a HCl/HNO3 acid leach for Cu, Ni, Zn, Fe, Mn, Ag and Pb; by FA-AAS for Au; by XRF for Ti, Nb, Sn, Sr, Zr, Ba and Y; by colorimetry for As and W following nitric/perchloric acid decomposition and carbonate sintering respectively; by cold vapour AAS using a hydrochloric, nitric and sulphuric acid digestion with potassium permanganate for Hg; by gravimetric method for S.
Geochem Maps Available:
Contour plots showing concentrations of elements in the heavy minerals. Histograms of analytical results.
|1||Maurice, Y.T. (1989). Résultats et interpretation d'un lévé géochimique des minèraux lourds, région du bas Saint-Laurent, Québec [SNRC 21N/6, 7, 9, 10, 11, 14, 15, 16; 22C/1, 2, 3]. Geological Survey of Canada, Open File 2036. (more)|
|1||1984-1994||Heavy Mineral Project, Gaspé region, Quebec 1984-1992 (more)|
|Minimum Latitude||Maximum Latitude||Minimum Longitude||Maximum Longitude|
The geographic extent of the survey is defined by the following polygons:
Covers parts of NTS 21N/6, 7, 9, 10, 11, 14, 15 and 16 and parts of 22C/1, 2, 3 in the Lower St. Lawrence region, Quebec. It is bounded to the northwest by the St. Lawrence River and to the south and east by province of New Brunswick. It is also bounded to the south by the state of Maine (U.S.A.).
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