Rosemont
Summary
| Stage | Production |
| Mine Type | Open pit |
| Mineralisation | Quartz hosted stockwork |
| Plant type | Crush, grind, pump |
| Throughput | 2mtpa |
| Reserve grade | 1.35g/t gold |
| Recovery | 93% |
| Mine life | 6 years |
| Ore reserves | 574koz2 |
| Mineral resources | 1.2Moz2 |
Rosemont was discovered in the 1980s and was partially mined as a shallow oxide open pit by Aurora Gold Limited in the early 1990s. Reported production was 222kt at 2.65g/t for 18,600 ounces of gold. The remaining resource at Rosemont has been held outright by Regis since 2006.
Regis completed 17,465 metres of infill RC drilling in 2012 with the aim of converting Inferred resources to Indicated category at the northern extremity of the Rosemont deposit. Regis then commissioned independent geological consultants EGRM Consulting Pty Ltd to conduct a re-estimation of its 2011 (1.08 million ounce) mineral resource estimate. This estimate was completed using the Multiple Indicator Kriging estimation technique on a block size of 20 m x 20 m x 5 m. Based on the Multiple Indicator Kriging, a selective mining estimate above a 0.5 g/t Au cut-off was generated to replicate a SMU size of 5 m x 5 m x 2.5 m.
The updated resource is as follows:
The Rosemont gold deposit is 100% owned by Regis and is located within 10 kilometres of the Garden Well Gold Project.
Rosemont was discovered in the 1980s and was partially mined as a shallow oxide open pit by Aurora Gold Limited in the early 1990s. Reported production was 222kt at 2.65g/t for 18,600 ounces of gold. The remaining resource at Rosemont has been held outright by Regis since 2006.
In 2013 Regis commenced construction of a 1.5 million tonne per annum crushing, grinding and pumping operation at the Rosemont Gold Project. The operation produces a crushed and milled ore product which is piped in a slurry form back to the Garden Well processing facility for leaching in the Garden Well CIL circuit. Construction of the project reached practical completion in October 2013.
To maximise operational flexibility the Company embarked on upgrading the leaching capacity of the Garden Well processing facility and the pumping capacity of the Rosemont ore slurry pipeline. The aim of this expansion was to maximise gold recoveries for the combined Garden Well and Rosemont ore flow through the wet plant of 7mtpa+. The upgrade was completed in the June 2014 quarter.