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ODM Heavy Mineral Concentration and grain separation: no VG counts-kimberlite boulders [#2]



Overburden Drilling Management Heavy Mineral Concentration and grain separation. Kimberlite boulders are crushed and disaggregated and the sediment is separated and sieved into the 0.106-0.25 mm, 0.25-0.5 mm, 0.5-1.0 mm and 1-2 mm fractions.

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.

Kimberlite boulders are disaggregated and screened with a 2 mm, 1 mm and 0.106 mm mesh respectively. The < 0.106 mm-1.00 mm fraction is pre-concentrated with respect to density using a shaker table. Samples are run twice through the shaking table. 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 methelyne iodide (SG 3.2) and separated magnetically with a hand magnet. No gold grains are recovered.

(Description taken from Open File 4361)

1 Bulk Weight (kg) (Should equal 2 + 3 + 8)
2 Oversize clasts (>2 mm) (g)
3 <0.106 mm total
4 0.106-2 mm methylene iodide (M.I.) separation-M.I. light fraction (g)
5 0.106-2 mm methylene iodide separation-M.I heavy fraction total (g) (not listed in apppendix but most likely the sum of 6 + 7)
6 0.106-2 mm  methylene iodide (M.I.) separation-M.I heavy fraction ferromagnetic total (g)
7 0.106-2 mm methylene iodide (M.I.) separation-M.I heavy fraction non-ferromagnetic total (g)
8 M.I. heavy fraction non-ferromagnetic processed split -0.106 0.25 mm (wash) (g)
9 M.I. heavy fraction non-ferromagnetic processed split 0.25-0.5 mm (g)
10 M.I. heavy fraction non-ferromagnetic processed split 0.5-1 mm (g)
11 M.I. heavy fraction non-ferromagnetic processed split 1-2 mm (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  6198     Wt_lt_0106 
4  6199     Wt_MI_Lght_106_200 
5  6200     Wt_MI_Hvy_106_200 
6  6201     Wt_MI_FMHvy106_200 
7  6202     Wt_MINFMHvy106_200 
8  6203     Wt_MINFM_106_025 

Associated Analytical Packages:

IndexPackage IDPackage Name
1  219     ODM Heavy Mineral Separation (kimberlite boulders #2)
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