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ODM Heavy Mineral Concentration and grain separation-VG counts [#1]
Overburden Drilling Management Heavy Mineral Concentrations and grain separation-1-2 mm fraction not table processed. < 1 mm fraction not sieved.
Overburden Drilling Management indicator mineral grain separation. The sample is split into a series of fractions as a precursor to mineral grain identification. This procedure is slightly different than the standard ODM flow chart.
The sample is disaggregated and screened with a 2 mm and 1 mm mesh respectively. Pebbles are screened from the > 2mm fraction and counted and classified. The < 1 mm fraction is pre-concentrated with respect to density using a shaker table. Samples are run twice through the shaking table and the concentrates are then panned, and gold grains are picked and counted and classified based on grain shape. The table concentrate is then put through diluted methylene iodide (specific gravity of 3.2) and the heavy mineral concentrate (HMC) is collected. The HMC is ferromagnetically separated. The 1-2 mm fraction is separated using methylene iodide (SG 3.2) and separated magnetically with a hand magnet.
(Description taken from Open File 3576)
|1||Total sample weight (kg-wet)|
|2||Oversize clasts (>2 mm) (kg-wet)|
|3||Wet sieve < 2 mm fraction total) (kg-wet)|
|4||Total 1 – 2 mm fraction (g-dry)|
|5||1 – 2 mm table concentrate methylene iodide (M.I.) separation -M.I. heavy fraction ferromagnetic (g-dry)|
|6||1 – 2 mm table concentrate methylene iodide (M.I.) separation -M.I. heavy fraction non ferromagnetic (g-dry)|
|7||< 1 mm table concentrate (g-dry)|
|8||< 1 mm table concentrate methylene iodide (M.I.) heavy fraction ferromagnetic total (g-dry)|
|9||< 1 mm table concentrate methylene iodide (M.I.) heavy fraction non-ferromagnetic total (g-dry)|
Sample material: solid
Sample weight: unstated
|Index||Method Order||Method ID||Quantity||Detection Limit|
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