HMC separation (SRC/CF)

Keyword Definition

Saskatchewan Research Council / CF Minerals Research heavy mineral processing

25 kg (5 gallon) till samples were submitted to the Saskatchewan Research Council, Saskatoon, for preliminary processing.  Each sample was disaggregated in a cement mixer with the aid of sodium metaphosphate (calgon).  In a few cases, repeated washings were required to prevent flocculation of sulphate and carbonate rich samples.  The disaggregated till was screened at 10 mesh to remove the >2 mm fraction which was washed, dried and screened prior to lithological analysis.  The entire <2 mm fraction, washed of its clay and fine silt fraction, was then submitted to CF Mineral Research, Kelowna, for further processing.

CF Mineral Research used the following procedures.  The sand/coarse silt fraction of the till samples was separated at 2.96 SG using tetrabromoethane.  The >2.96 SG fraction was subsequently separated at 3.2 SG using methylene iodide (MI) diluted with acetone.  The MI concentrate was screened at 250 μm (60 mesh) and 63 μm (230 mesh).  Ferromagnetic minerals, i.e., magnetite, were removed using a Carpco top feed roll separator.  The almandine and ferro-ilmenite rich paramagnetic fraction was removed using a Carpco bottom-feed separator, followed by Frantz isodynamic separation at low amperage.  A higher amperage Frantz pass was then used to remove the non-magnetic fraction from the weakly paramagnetic fraction, which was subsequently visually examined for potential kimberlitic indicator minerals.

[Description taken from GSC Open File 2685]

Category: Sample preparation procedures

Keywords corresponding to sample preparation procedures. Taken from the “Sample_Preparation_Methodss_SHARED” database table.

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