Landore Resources Ld - DETAILED METALLURGICAL ASSESSMENT BAM GOLD DEPOSIT
LANDORE RESOURCES LIMITED
(AIM Ticker: LND.L)
DETAILED METALLURGICAL ASSESSMENT
BAM GOLD DEPOSIT
JUNIOR LAKE PROPERTY
· 98% extraction of gold is achievable with conventional milling, grinding to 100% passing 212 micron followed by gravity separation (+65%) and cyanide leaching.
Reagent consumption was very low with Cyanide Consumption at ±0.40 kg/t and
Lime Consumption at ±0.60 kg/t.
· Heap leaching with fine crushing and agglomeration can achieve acceptable extractions of gold (±84% at test conditions).
· The results from the Metallurgical studies, will be incorporated into the Preliminary Economic Assessment (PEA) scheduled for completion in
Commenting on this report, Chief Executive Officer of
"These outstanding metallurgical results, showing 98% recovery of gold using a simple conventional milling process, further supports our expectations that the rapidly growing BAM Gold deposit has the strong potential to become a producing mine in the near future."
The full Metallurgical Report can be found on Landore's web site www.landore.com and also via the links below:
"Metallurgical Report-Phase 1 26th
Whole core from the
Phase 1 metallurgical test work has provided the following insights:
1. Significant free gold is present in the composite tested.
2. High extractions of gold are achievable with grinding, gravity separation (+65%), and cyanide leaching (+95%) with overall extractions around 98%.
3. Cyanide and lime consumptions were low in the leaching tests.
4. Liberation of gold particles is reduced in size-fractions above 300 microns.
5. Flotation of the BAM composite achieved reasonable extractions of gold, albeit at low concentrate grades.
6. Heap leaching with fine crushing and agglomeration can achieve acceptable extractions of gold (±84% at test conditions).
7. In fine-ground material, gold occurs predominantly as coarse liberated particles and as attachments and inclusions in chlorite and cobaltite. Minor quantities of gold are associated with tellurides.
8. Cyanide leach extractions of gold at sizes below 300 microns do not appear to be dependent on particle size.
9. Sparging agitation leach tests with oxygen improves the extraction of gold over sparging with air.
10. Reasonable variations of cyanide concentration and percent solids do not appear to influence gold extractions from agitated leach tests at typical grind sizes.
11. Agitation leach pulps are amenable to
12. Silver and copper species are present in the ore but only partially dissolved by cyanide.
1.2 Processing Options:
The current testing indicates that various processing options are possible with the attendant capital and operating costs and gold extractions. Capital and operating costs are not part of this exercise however, the following estimates of extraction and fundamental reagent consumptions should allow reasonable recommendations to be made.
1.2.1 Grind-Gravity-Agitation Leach:
A conventional mill with grinding to 100% passing 212 microns with a robust gravity circuit on the classifying cyclone underflow followed by a CIP or CIL agitation leach would likely achieve the following:
Gold Extraction ±98% (not accounting for soluble losses)
Cyanide Consumption: ±0.40 kg/t
Lime Consumption ±0.60 kg/t as CaO
It should be understood that the concentrate developed in this phase of the testing was insufficient to determine the reagent consumptions of concentrate leaching, which will be in addition to these values.
A conventional mill with grinding to 100% passing 212 microns with a robust gravity circuit on the classifying cyclone underflow and a flotation circuit would likely achieve the following:
Gold Extraction ±88.5%
It should be noted that the concentrates in this option did not achieve a gold grade sufficient to be sold to a smelter. Additional downstream processing and the attendant reduction in extraction would have to be considered if this option were to be pursued.
1.2.3 Coarse Crushed Heap Leach:
Crushing to 100% minus 31 mm and leaching in a heap would likely achieve the following:
Gold Extraction: ±52% (based on a 4% discount for lab vs. field extractions)
Cyanide Consumption: 0.06 kg/t
Lime Consumption: 0.06 kg/t as CaO
1.2.4 Fine Crushed Heap Leach:
Crushing to 100% minus 6 mm, agglomeration with cement, and leaching in a heap would likely achieve the following:
Gold Extraction ±84% (based on a 4% discount for lab vs. field extractions)
Cyanide Consumption: 0.12 kg/t
Lime Consumption: 0.07 kg/t as CaO.
Cement Consumption: 3-4 kg/t (assumed requirement for agglomeration)
This does not account for the difficulty in operating a heap leach with the site conditions: lower extractions and weather curtailments of production are likely.
Based on the current level of testing, the following recommendations are made:
1. Eliminate flotation as a viable unit operation.
2. Develop further understanding of a milling/gravity/leach circuit. This would require investigation of the following:
a. Variability of the deposit for physical properties and amenability to the flowsheet.
b. HPGR (High Pressure Grinding Roll) crushing as a way to increase the gold liberation.
c. Rheology/filtration/thickening tests on ground and cyanided pulps.
d. Gravity-recoverable gold tests to establish a baseline.
e. Cyanide destruction in slurried tails.
f. Gold loading tests on activated carbon from pulps.
g. Cyanidation of gravity concentrate.
3. Develop additional understanding on the viability of heap leaching. This would require investigation of the following:
a. Cold temperature leach extraction rate.
b. Heap stability testing to determine agglomeration requirements and allowable heap height.
c. HPGR crushing as a way to increase gold extraction rate.
d. Effect of cyanide cure on extraction rate.
e. Effect of application rate on leach extraction.
f. Gold loading tests on activated carbon in leach solutions.
End of Metallurgical Report Summary"
The results from the Metallurgical studies will be incorporated into the PEA scheduled for completion in
A highly prospective Archean greenstone belt traverses the Junior
- ENDS -
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