A set of rougher flotation tests were conducted on the South Cluster composites to test the viability of such a method. These tests recovered about 82% to 90% of the feed gold, at a coarser primary grinds targeting 125 microns, 80% passing. This demonstrates potential for significant improvement and future test work will be conducted investigating a flow sheet incorporating both flotation and cyanidation of the flotation products. Incorporation of a flotation extraction process could be viable if grinding economics favor coarser primary grinding.
North Cluster Results
At primary grind sizing targeting 75 microns, 80% passing, with 1,000 ppm sodium cyanide ("NaCN") concentration in the leaching and a 48 hour leach duration, the North Cluster samples showed a gravity recovery of between 28 and 38% and combined recovery of approximately 94% feed gold.
Two additional sets of gravity and cyanide leach tests were conducted on the North Cluster composites with 96 hour leach durations; these were conducted at primary grind sizing targeting 75 and 50 microns, 80% passing. At the 75 micron target, overall gold recoveries from the feed were approximately 97%. Decreasing the primary grind to 50 microns improved gravity recovery and resulted in overall gold recoveries of approximately 98% feed gold.
Commencing Phase 2 Metallurgical Testing
Following the presentation of the results of Phase 1 metallurgical testing, Integra management authorized a Phase 2 program which will focus on determining the impact on gold recoveries when flotation is included in the flow sheet, especially for the South Cluster samples. The work has started and should be completed within the next 6 to 8 weeks. Any decisions on further, larger scale test work, which may include drilling with PQ diameter core, will be made once results from Phase 2 work have been assessed by the Company.
Detailed mineralogy will also be conducted during Phase 2 testing to assess sulfide mineral liberations and associations.
Project and Company Profile
Integra's Lamaque Gold Project is located in the heart of the Val d'Or gold camp in the Province of Quebec, Canada, approximately 550 km northwest of Montreal. The Lamaque Project's primary target, the South Cluster, is 4 km from the City of Val d'Or. Quebec is rated one of the best mining jurisdictions in the world. Infrastructure, human resources and mining expertise are readily available.
The Company's primary objective is to continue to prove up additional resources while advancing the existing resource towards production. The project is split into two clusters, the North Cluster and the South Cluster, located approximate 1 km from each other.
South Cluster - No. 4 Plug and Triangle Zone
The South Cluster is the Company's top priority, and currently has a high grade gold resource of 444,962 inferred ounces grading 11.06 g/t Au in 1,263,046 tonnes, and 61,168 indicated ounces grading 13.51 g/t Au in 140,840 tonnes. Including 2013 drilling, over 34,000 meters of drilling has been completed on the South Cluster since the last resource estimate. An updated resource estimate is expected to be completed in Q2, 2013.
North Cluster - Parallel Zone, Forestel Zone and No. 5 Plug
The North Cluster hosts an NI 43-101 resource estimate of 69,981 inferred ounces grading 2.03 g/t Au in 1,072,484 tonnes, and 101,794 indicated ounces grading 4.8 g/t Au in 659,959 tonnes. An additional 8,000 meters of drilling has been completed on the North Cluster since the last resource which will also be included into the Q2, 2013 updated resource estimate.
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