Reserves and Resources
|Mining area||Terrace complex||Bottom cut-off size||Volume m3||Grade*ct/100m3||ValueUSD/ct|
|Saxendrift||Brakfontein Hill (“BHC”)
|Saxendrift Hill||Saxendrift Hill (“SHC”)
|Saxendrift Extension||Saxendrift River (“SRC”)
|Total Indicated Mineral Resource||5,151,900||0.42||2,500|
|Saxendrift||Brakfontein Hill (“BHC’)
|Saxendrift Hill||Saxendrift Hill (“SHC’)
|Saxendrift Extension||Saxendrift River (“SRC’)
|Kwartelspan Rooikoppie||Kwartelspan Complex (“KPC’)||5mm||301,000||0.60||2,500|
|Total Indicated Mineral Resource||3,534,000||0.5||2,200|
*Although the effective bcos going forward may be adjusted upward to 6mm, the average diamond values or grades will not be adjusted in order to account for the number of -6mm material that will still be recovered.
Mineral Resources that are not Mineral Reserves do not have demonstrated economic viability.
Probable Mineral Reserves estimated for the Saxendrift Mine (as at 28 February, 2015)
|Terrace Complex||Mining Block||Volume (m³)||Grade* (Ct/100m³)||Carats||Value* (USD/ct)|
|Brakfontein Hill (“BHC”) B1 terrace||Block M10||31,500||0.36||113.40||2,700|
|Total Probable Reserve||187,300||0.41||761.05||2,700|
* Bcos = 5mm
Inferred Mineral Resources on Niewejaarskraal Project (as at 28 February, 2015)
|Terrace Complex||Resource Block||Geological Domain||Volume (m³)||Grade* (Ct/100m³)||Value* (USD/ct)|
|A Terrace||Block 1||BIF-rich brown gravels||6,286,000||0.5||1,850|
|Block 2||BIF-poor brown gravels||3,420,000||0.3||1,850|
|Total Probable Reserve||11,524,000||0.4||1,850|
* Bcos = 6mm
* Both grade and diamond value of total Inferred Mineral Resource is a weighted average
* The diamond value is a 2-year trailing average
* All values/grades are rounded off to reflect the low level of confidence in the estimate.
Inferred Mineral Resources on Remhoogte Project (as at 06 February, 2015)
|Terrace Complex||Resource Block||Volume (m³)||Grade* (Ct/100m³)||Value* (USD/ct)|
|Total Probable Reserve||7,056,000||0.9||2,900|
* Bcos = 5mm
Resource estimation on Wouterspan (as at 28 February, 2013)
|Terrace Complex||Resource Classification||Volume (m³)||Grade* (Ct/100m³)||Value* (USD/ct)|
* Bcos = 5mm
# Due to a lack of reliable data on SHC, the 5mm bottom cut-off size (bcos) values are not included at Indicated Mineral Resource classiﬁcation.
Diamond values (under “Values”) for BHC, SHC, KPC and Niewejaarskraal are based on a two-year moving average (from +10,000cts from the BHC terrace on the Saxendrift Mine at a 5mm bcos).
Diamond values for SRC are based on the 5mm bcos sales data for FY2013 only.
Diamond values for Wouterspan are based on extrapolation of FY2011 data at 5mm bcos.
Tirisano data is at 2 February 2012.
Resource and Reserve estimates completed by Rockwell’s Group Technical Manager, GA Norton, (PrSciNat), a Qualiﬁed Person who is not independent of the Company and reviewed by TR Marshall, PhD (PrSciNat), an independent Qualiﬁed Person.
Note: The Indicated Mineral Resources on the BHC terrace of the Saxendrift mine are inclusive of the Mineral Reserves.
Download the PDF here
Acquisitional Projects: On January 6, 2015, Rockwell announced that it had reached an agreement to acquire the Remhoogte/Holsloot Project, and released a Technical Report on March 9, 2015. To download the Technical Report: