Analytical Suite Metadata

ODM HMC processing and VG counts [#2]

ODM HMC Processing and VG Counts –micropanning VG

General Methodology:

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.

A split from the bulk 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. 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 and the non-ferromagnetic heavy mineral concentrate (NFM-HMC) is screened to recover the 0.25-0.50 mm and 0.5-1.0 mm fractions to be sent to I.M. Morrison for indicator mineral picking. Samples with abundant indicator minerals in the < 1mm fraction are processed for heavy mineral concentrates directly by using diluted methylene iodide. The < 0.25 mm magnetic and non-magnetic fraction is micro-panned for gold. Pebbles are counted as they are being sieved and put into 4 broad classes; volcanics/sediments, granitics, limestone/carbonates and others).

(Description taken from Open File 6047)

1 Amount processed (kg)
2 Oversize clasts (>2 mm) (kg)
3 Wet sieve (1 and 2 mm)
4 Table feed shaker sample run twice
5 < 1 mm table concentrate total (g)
6 < 1 mm table concentrate methylene iodide (M.I.) separation-M.I. light fraction (g)
7 < 1 mm table concentrate methylene iodide (M.I.) separation -M.I. heavy fraction (g)
8 < 1 mm methylene iodide (M.I.) heavy fraction non-ferromagnetic fraction total (g)
9 < 1 mm M.I. heavy fraction non-ferromagnetic processed split < 0.25 m (g)
10 < 1 mm M.I. heavy fraction non-ferromagnetic processed split 0.25-0.5 mm (g)
11 < 1 mm M.I. heavy fraction non-ferromagnetic processed split 0.5-1 mm (g)
12 < 1 mm M.I. heavy fraction ferromagnetic processed split (g)
13 1 - 2 mm table concentrate methylene iodide (M.I.) separation -M.I. heavy fraction (g)


Instrument: unstated

Sample material: solid

Sample weight: unstated

Analytical Technique:

Hierarchical classification

Technique >> Physical techniques >> Mineral grain separation



Analytical Decomposition:

Hierarchical classification

Decomposition >> None



Analytical Methods:

IndexMethod OrderMethod IDQuantityDetection Limit
1  6001     Wt_BulkRec 
2  6044     Wt_OvrSize 
3  6045     Wt_100_200 
4  6206     Wt_TblFeed_lt100 
5  6048     Wt_MI_Lght_1 
6  6049     Wt_MI_Hvy_1 
7  6050     Wt_MIHvyNFM_Tot_1 
8  6217     Wt_HMCNFMlt25_WASH 
9  6052     Wt_MIHvyNFM_25_50 
10  10  6053     Wt_MIHvyNFM50_100 
11  11  6178     Wt_MIHvyNFM100_200 

Associated Analytical Packages:

IndexPackage IDPackage Name
1  240     ODM HMC Processing and VG counts-3 mineral ID
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