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ODM Heavy Mineral Concentration and grain separation: VG counts-kimberlite samples



Overburden Drilling Management Heavy Mineral Concentration and grain separation. Kimberlite boulders are crushed and disaggregated and the sediment is separated and sieved into the 0.25-0.5 mm, 0.5-1.0 mm and 1-2 mm fractions. The 0.180 mm fraction is sieved from the samples and discarded.

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 +/-10 kg split from the bulk sample is disaggregated and screened with a 2 mm and 1 mm mesh respectively. The < 1 mm fraction is pre-concentrated with respect to density using a shaker table. Samples are run twice through the shaking table, panned and gold grains are separated, picked and classified according to 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 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 picked for indicator minerals. The < 0.180 mm fraction is sieved from the samples and the 1-2 mm fraction is separated using methelyne iodide (SG 3.2), and separated magnetically with a hand magnet.

(Description taken from Open File 4492)

1 Table Split (kg)
2 Oversize clasts (>2 mm) (kg)
3 Wet sieve (1 and 2 mm) (kg)
4 Sieved 0.180 mm
5 Table feed shaker sample run twice (kg)
6 < 1 mm table concentrate total (g) ( should equal rows 6 + 7 + 8)
7 < 1 mm table concentrate methylene iodide (M.I.) separation-M.I. light fraction (g)
8 < 1 mm table concentrate methylene iodide heavy fraction ferromagnetic total (g)
9

< 1 mm methylene iodide (M.I.) heavy fraction non-ferromagnetic total (g)

(should equal sum of rows 9 + 10 + 11 + 12)

10 < 1 mm M.I. heavy fraction non-ferromagnetic processed split -0.180-0.25 mm (g)
11 < 1 mm M.I. heavy fraction non-ferromagnetic processed split 0.25-0.5 mm (g)
12 < 1 mm M.I. heavy fraction non-ferromagnetic processed split 0.5-1 mm (g)
13 < 1 mm M.I. heavy fraction ferromagnetic processed split (g)
14 1 – 2 mm table concentrate methylene iodide (M.I.) separation  -M.I. heavy fraction non  ferromagnetic (g)

 

Instrument: unstated

Sample material: solid

Sample weight: unstated


Analytical Technique:

Hierarchical classification

Technique >> Physical techniques >> Mineral grain separation

Children

None


Analytical Decomposition:

Hierarchical classification

Decomposition >> None

Children

None


Analytical Methods:

IndexMethod OrderMethod IDQuantityDetection Limit
1  6043     Wt_Processed 
2  6044     Wt_OvrSize 
3  6045     Wt_100_200 
4  6204     Wt_lt_0180 
5  6206     Wt_TblFeed_lt100 
6  6207     Wt_TblConc_lt_100 
7  6048     Wt_MI_Lght_1 
8  6049     Wt_MI_Hvy_1 
9  6050     Wt_MIHvyNFM_Tot_1 
10  10  6205     Wt_MINFM_0180_025 
11  11  6052     Wt_MIHvyNFM_25_50 
12  12  6053     Wt_MIHvyNFM50_100 
13  13  6178     Wt_MIHvyNFM100_200 

Associated Analytical Packages:

IndexPackage IDPackage Name
1  220     ODM Heavy Mineral Separation and VG counts (kimberlite boulders #4)
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