annexc - Newmont Mining Corporation

Annex C4 – Water Resources Supplemental Information C4 - 32
� Golder Associates (2004b) tested 12 piezometers in the proposed mine pit area.
These piezometers are completed in each of the major units – saprolite, saprock,
and bedrock. Falling head tests were performed in nine of these piezometers with a
geometric mean hydraulic conductivity of 7 x 10 -7 metres per second (m/sec) for
saprolite and saprock, and 6 x 10 -7 m/sec for bedrock. The hydraulic conductivity
measured in fractured intervals of the upper bedrock unit was 5 x 10 -6 m/sec. In
addition, Golder Associates (2004b) performed packer tests in four boreholes in the
fault shear zone, with a geometric mean hydraulic conductivity of 3 x 10 -7 m/sec.
Well yields for the tests were up to 80 litres per minute (l/min).
� SGS (2005) tested 10 monitoring wells throughout the Project Area. These wells
are completed in greywacke and schist saprock with depths ranging from 24 to 61 m.
Results of SGS (2005) aquifer tests for the 10 monitoring wells indicate hydraulic
conductivity is in the range of 2 x 10 -4 to 9 x 10 -7 m/sec. Average hydraulic
conductivity for the 10 wells is 2 x 10 -5 m/sec. Well yields for the test were from
about 50 to 500 l/min.
� Golder Associates (2006) tested two deep pumping wells: KPW-1 (200 m depth) and
KPW-2 (150 m depth), both located in the proposed mine pit area. Range in
hydraulic conductivities from testing these two wells was 1 x 10 -6 to 2 x 10 -9 m/sec.
Falling head tests performed on four additional bedrock piezometers had a
geometric mean hydraulic conductivity of 9 x 10 -7 m/sec. Air lift water yield from
these tests ranged 4 to 18 l/min.
� Knight Piesold (2006) tested eight production/test wells in the Project Area.
Hydraulic conductivity values are from 8 x 10 -5 to 4 x 10 -6 m/sec. Sustained yields
during the tests were in the range of 18 to 360 l/min.
The graph in Figure C4-13 shows average hydraulic conductivity for all tests conducted in
the following lithologic units (from upper to lower depths):
� Saprolite: 4.5 x 10 -7 m/sec
� Saprolite/Saprock: 4.7 x 10 -7 m/sec
� Saprock: 2.4 x 10 -5 m/sec
� Bedrock: 3.5 x 10 -6 m/sec
� Graphite Shear Zone: 1.5 x 10 -7 to 3.6 x 10 -7 m/sec
Akyem Gold Mining Project November 2008 FINAL EIS