yeah there was news released yesterday. Excellent Metallurgical Results .
Highlights
· Parcel of ore mined from the company’s Woolshed Gully decline.
· 98.4% gold recovery to concentrate through simple gravity separation.
· 99.3% total gold recovery to concentrate through a combination of gravity
separation and flotation.
· Optimum grind size extremely coarse.
· Probability of high recovery, low cost processing.
Metallurgical Results
Ballarat Goldfields has completed its first phase of metallurgical test work. Gold recovery
was determined by testwork carried out at the laboratories of Gekko Systems, whilst
crushing and grinding testing was conducted at AMDEL.
Gravity concentration at progressive grind sizes was tested using 26kg of ore, riffle split
from a sample of approximately 200kg, mined from the 130m level.
The initial gold head assay of this sample was 94.2 gram per tonne. This was significantly
higher than the assay-predicted grade of 17 gram per tonne and not broadly
representative of the expected mine grade.
Consequently, a test work sample was then prepared with the coarse gold particles
removed. The gold assay for the testwork sample used was 24.3 gram per tonne.
This testwork resulted in 98.4% recovery of gold being concentrated into 8.6 per cent of
the weight. Additional flotation testwork raised the total recovery to 99.3 per cent of the
total gold concentrated into 10.4% of the weight.
The gravity and float concentrates were subjected to intensive cyanidation leach tests,
with 24-hour leach recoveries varying from 96.4 per cent to 98.8 per cent without
regrinding.
Single pass tabling testwork indicated that gravity recovery was highest at the coarsest
grind size tested (100 per cent passing 600 microns).
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