O3 Mining Reports Positive Metallurgical Results from Malartic H Deposit at Marban Alliance
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Highlights from Test Work:
- Overall gold extraction reached 92.3% after 48 hours of cyanide leaching.
- Average bond ball mill work index at 13.5 kWh/t.
The metallurgical testwork was conducted to assess the initial potential gold recoveries for the deposit. The program included head characterisation, comminution testing, gravity, cyanide leach testing, cyanide detox, oxygen uptake, solid/liquid separation, and rheology tests.
Comminution results showed, moderately soft to medium hardness with bond ball mill work index ranging from 12.5 to 14.1 with an average of 13.5 kWh/t.
Table 1: Comminution Test Results
|
Axb |
Abrasion Index (g) |
Ball Working Index (kWh/t) |
Malartic H(1) |
38.0 |
0.3 |
13.5 |
Note: |
(1) Malartic H results represent the average of two key composites representing the main geological domains and one main composite. |
Gold recovery program consisted of testing the samples under a gravity-tail leach flowsheet similar to the process used in the
The three-stage extended gravity recoverable gold (E-GRG) test on the Malartic H main composite showed a value of 59%.
Global recovery tests were performed on material ground at a target of 80% passing 85µm. Gravity recovery was performed with a knelson MD-3 and mozley laboratory separator. Cyanide leaching test used a 48-hour bottle roll test at a pulp density of 40% solids, pH level of 10.5 (maintained using lime), sodium cyanide concentration of 1 g/L (maintained), and oxygen sparged. Solutions were sampled and assayed at 2, 4, 12, 24, 36, and 48 hours for gold.
Total gold extraction for the 10 samples from the Malartic H deposit ranged from 91.6% to 98.7% with an average of 92.9% for an average calculated head grade of 1.35 g/t.
Table 2: Recovery Test Results
|
Head Grade (g/t) |
Grind Size (μm) |
Gravity Recovery |
Leach Recovery (24H) |
Leach Recovery (48H) |
Global |
Malartic H(1) |
1.35 |
80.6 |
33.8 % |
87.7 % |
89.6 % |
92.9 % |
Notes: |
(1) Malartic H results represent the average of seven variability samples, two key composites representing the main geological domains, and one main composite. |
Figure 1 – Marban Alliance Surface Map
Malartic H Deposit
The Malartic H deposit has a recognized strike length of 950 metres, 300 metres wide, and down to a vertical depth of 500 metres. It is located within five kilometres of the proposed processing plant described in the pre-feasibility study published on
Qualified Persons
The scientific and technical content of this news release has been reviewed and approved by Mr. Jean-Félix Lepage (OIQ #5053461), Vice-President, Projects of
Quality Assurance/Quality Control
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This news release contains "forward-looking information" within the meaning of the applicable Canadian securities legislation that is based on expectations, estimates, projections, and interpretations as at the date of this news release. Forward-looking statements including, but are not limited to, statements with respect to the significance of the gold recovery results reported herein, our assumptions with respect to gold recoveries, the significance of metallurgical test-work, and ability of exploration information (including drilling data) to accurately predict mineralization. Any statement that involves discussions with respect to predictions, expectations, interpretations, beliefs, plans, projections, objectives, assumptions, future events or performance (often but not always using phrases such as "expects", or "does not expect", "is expected", "interpreted", "management's view", "anticipates" or "does not anticipate", "plans", "budget", "scheduled", "forecasts", "estimates", "believes" or "intends" or variations of such words and phrases or stating that certain actions, events or results "may" or "could", "would", "might" or "will" be taken to occur or be achieved) are not statements of historical fact and may be forward-looking information and are intended to identify forward-looking information. Except for statements of historical fact relating to the Corporation, certain information contained herein constitutes forward-looking statements. Forward-looking information is based on estimates of management of the Corporation, at the time it was made, involves known and unknown risks, uncertainties and other factors which may cause the actual results, performance or achievements of the companies to be materially different from any future results, performance or achievements expressed or implied by such forward-looking information. Such factors include, among others, risks relating to the ability of metallurgical test-work to accurately predict mineralization or recoverable gold; the ability of exploration activities (including drill results) to accurately predict mineralization; errors in management's modelling; the ability of any material to be mined in a matter that is economic. Although the forward-looking information contained in this news release is based upon what management believes, or believed at the time, to be reasonable assumptions, the parties cannot assure shareholders and prospective purchasers of securities that actual results will be consistent with such forward-looking information, as there may be other factors that cause results not to be as anticipated, estimated or intended, and neither the Corporation nor any other person assumes responsibility for the accuracy and completeness of any such forward-looking information. The Corporation believes that this forward-looking information is based on reasonable assumptions, but no assurance can be given that these expectations will prove to be correct and such forward-looking statements included in this news release should not be unduly relied upon. The Corporation does not undertake, and assumes no obligation, to update or revise any such forward-looking statements or forward-looking information contained herein to reflect new events or circumstances, except as may be required by law. These statements speak only as of the date of this news release.
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