Russian gold mine realised US$340,000 additional value

Russian gold mine realised US$340,000 additional value

russia-gold-disseminated-blast-monitoring

Commodity Ore Grade Geology Powder Factor Flitches Location
Gold High and low Disseminated Sulphide 1.15 kg/m3 1 Russia
This disseminated sulphide mine is one of the top producing open-pit gold operations in Russia.
  • Mineralisation is disseminated in sedimentary schists and shales
  • Blasts are fired in a 10 metre bench
  • The site contains high grade (3.5 g/t) and low grade ores

Challenges

Substantial movement of ore was not monitored or accounted for
  • Misclassification of ore (i.e. high grade ore is stockpiled as low grade or low grade ore is sent to the mill as high grade)
  • Ore loss, with gold being sent to the waste pile
  • Dilution, with tonnes of waste being treated as ore

Solution

The BMM System accurately measured blast movement and translated post-blast dig lines
  • Blast movement monitors (BMMs) were installed in monitoring holes throughout the shot
  • Installation and detection as per site standard operating procedures
  • BMM Explorer software calculated new dig lines, and areas of ore loss and dilution that would have occurred without monitoring

Results

Less dilution and more ore generates additional value of US$340,000
Significant movement occurs within all blasts. Variation of ±50% from the mean horizontal movement is common and occurs at this mine.
  • Measured horizontal movement ranged from 2.5 m to 14 m (8 to 46 ft) and vertical movement of up to 4.5 m (15 ft)
As a result of accurately accounting for blast movement, this mine:
  • Reduced dilution—3,800* tonnes (13%) of waste were diverted from the mill, saving US$75,000**
  • Maximised ore yield by recovering 2,600 tonnes of additional ore, valued at US$265,000***
* Numbers are rounded
** Estimate based on mine milling costs of US$20 per tonne
*** Calculated at a gold price of US$1,250/oz.
Accounting for blast movement generated additional value of $340,000
russia-gold-blast-map
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