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Eastern Europe gold mine realised US$294,000 in additional revenue

eastern europe gold mine

Commodity Ore Grade Geology Powder Factor Location
Gold 1.0 g/t** Structured 0.84 kg/m3 Eastern Europe

This operation is one of the top producing open-pit gold mines in Eastern Europe.

  • The mineralisation is structural
  • Ore shots are blasted in 7.5 m benches, which are then mined in a single pass

Challenges

Substantial movement of ore is 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, misclassification and dilution that would have occurred without monitoring

Results

Less dilution, less misclassification and more ore
US$294,000 additional value from one blast

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 3.5 m to 15 m (11 to 48 ft) and vertical movement of up to 2.4 m (8 ft)

As a result of accurately accounting for blast movement, the mine:

  • Reduced dilution by 15%—7,200* tonnes of waste were diverted from the mill
  • Avoided misclassification—13%, 6,200 tonnes, of ore were correctly classified
  • Maximised ore yield—an additional 235 oz. of gold was recovered, valued at US$294,000***

* Numbers are rounded
** Average grade of ore polygons
*** Calculated at a gold price of US$1,250/oz

Accounting for blast movement added US$294,000 of value in this blast

eastern europe gold mine blast map