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ODM Heavy Mineral Concentration and grain separation-VG counts [#4]



Overburden Drilling Management Heavy Mineral Concentrations and grain separation-1-2 mm fraction not table processed. Sieved to 0.25-0.5 mm, 0.5-1.0 mm and 1 -2 mm.

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, 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 1-2 mm fraction is separated using methylene iodide (SG 3.2) and separated magnetically with a hand magnet.

(Description taken from Open File 3775)

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

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

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

9 < 1 mm M.I. heavy fraction non-ferromagnetic processed split - 0.25 mm (wash) (g)
10 < 1 mm M.I. heavy fraction non-ferromagnetic processed split -<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  6046     Wt_TblFeed 
5  6047     Wt_TblConc 
6  6048     Wt_MI_Lght_1 
7  6049     Wt_MI_Hvy_1 
8  6050     Wt_MIHvyNFM_Tot_1 
9  6051     Wt_MIHvyNFM_lt25_1 
10  10  6052     Wt_MIHvyNFM_25_50 
11  11  6053     Wt_MIHvyNFM_50_100 
12  12  6178     Wt_MIHvyNFM100_200 
13  13  6179     Wt_MIHvy_FM100_200 

Associated Analytical Packages:

IndexPackage IDPackage Name
1  216     ODM Heavy Mineral Separation and VG counts (kimberlite boulders #3)
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