REVIEW OF OPERATIONS: WEST AFRICA REGION
OVERVIEW
Location: The Tarkwa gold mine is located
in southwestern Ghana, about 300 km by
road west of Accra, the capital, at latitude
5°15’N and longitude 2°00’W. It is situated
some 4 km west of the town of Tarkwa with good
access roads and an established infrastructure,
which is served by a main road connecting the
port of Takoradi some 60 km to the southeast
on the Atlantic coast. Infrastructure: Multiple
open pits (currently six), two heap leach facilities
and a CIL plant. Geology: The ore body at
Tarkwa consists of a series of sedimentary
banket quartz reef units (conglomerates) of
the Tarkwaian System that are very similar to
those mined in the Witwatersrand Basin of
South Africa. The operation is currently mining
multiple reef horizons from open-pits and there
is potential for underground mining in the future.
Employees in service: 1,805 permanent
employees, 44 temporary employees and
2,846 contractors.
SAFETY AND ENVIRONMENT
The general safety performance of Tarkwa
improved year on year with no fatalities,
while the lost day injury frequency rate was
unchanged at 0.26. The Safe Production Rules
programme was formally launched in May 2009
by management, union representatives and
safety officials. This event was successful in
creating a high degree of awareness.
Tarkwa also retained its ISO14001:2004
(Environmental Management System) certification
following an external audit during the year. The
mine also retained its full compliance to the ICMI
Cyanide Code.
OPERATIONAL REVIEW
Gold produced decreased by five per cent from
646,000 ounces in F2008 to 612,000 ounces
in F2009. This was due to teething problems
encountered during commissioning of the CIL
expansion plant in mid-year and the slightly
lower grades mined.
Tons processed decreased from 22.04 million
in F2008 to 21.27 million in F2009. This was
mainly due to a decrease in tons treated at the
South heap as this ore was treated at the new
CIL plant to improve its recovery. However,
despite an increase in tons milled at the CIL
plant, the teething problems and the slightly
lower grade did not offset the decrease in
production from the heap leach facility.
Tons mined increased from 113.3 million to
132.6 million and ore mined increased from
19.9 million tons to 21.7 million tons.
Revenue increased from US$532 million in
F2008 to US$537 million in F2009. Revenue
from the higher gold price was partially offset by
the lower gold production.
Operating costs, including gold-in-process
movements, increased by 15 per cent from
US$278 million in F2008 to US$320 million
in F2009. This increase was mainly due to
increased milling at the expanded CIL plant,
which required additional ball mill grinding
media, increased power and diesel inputs,
together with the increase in tons mined.
Total cash cost increased from US$430 per
ounce in F2008 to US$521 per ounce in
F2009 as a result of the higher costs and lower
production.
Operating profit, before amortisation, decreased
from US$253 million in F2008 to US$217 million
in F2009. Operating margin decreased from
48 per cent in F2008 to 40 per cent in F2009.
Capital expenditure decreased from
US$212 million in F2008 to US$201 million in
F2009. The majority of this expenditure was
for the completion of the CIL plant expansion,
ongoing pre-stripping, increasing the primary
mining fleet and relocation of a power substation.
Notional cash expenditure increased from
US$766 per ounce in F2008 to US$881 per
ounce in F2009.
F2010 Focus Areas
- The CIL expansion project is expected to
increase throughput to one million tons of
ore per month on a sustainable basis;
- The High Pressure Grinding Rolls pilot
project to start processing by second
quarter F2010; and
- Overall strip ratio is expected to increase
to 5.3.
|
Lost Day Injury Frequency Rate
per million man hours worked


|
|
Tarkwa Gold Mine
| |
|
|
|
|
2009 |
|
2008 |
|
2007 |
|
| |
Open pit mining |
|
|
|
|
|
|
|
|
|
| |
Waste mined |
|
'000t |
|
110,895 |
|
93,440 |
|
85,508 |
|
| |
Ore mined |
|
000t |
|
21,689 |
|
19,901 |
|
22,074 |
|
| |
Head grade |
|
g/t |
|
1.1 |
|
1.2 |
|
1.2 |
|
| |
Strip ratio |
|
W:O |
|
5.1 |
|
4.7 |
|
4.0 |
|
| |
Processing |
|
|
|
|
|
|
|
|
|
| |
Tons processed |
Milled |
'000t |
|
7,733 |
|
5,571 |
|
5,620 |
|
| |
|
Heap leach |
'000t |
|
13,540 |
|
16,464 |
|
17,019 |
|
| |
|
Total |
'000t |
|
21,273 |
|
22,035 |
|
22,639 |
|
| |
Yield |
Milled |
g/t |
|
1.4 |
|
1.5 |
|
1.5 |
|
| |
|
Heap leach |
g/t |
|
0.7 |
|
0.7 |
|
0.8 |
|
| |
|
Combined |
g/t |
|
0.9 |
|
0.9 |
|
1.0 |
|
| |
Gold produced |
Milled |
'000oz |
|
314 |
|
267 |
|
272 |
|
| |
|
Heap leach |
'000oz |
|
298 |
|
379 |
|
425 |
|
| |
|
Total |
'000oz |
|
612 |
|
646 |
|
697 |
|
| |
|
Total |
kg |
|
19,048 |
|
20,095 |
|
21,684 |
|
| |
Total cash costs |
|
US$/oz |
|
521 |
|
430 |
|
333 |
|
| |
Notional cash expenditure |
|
US$/oz |
|
881 |
|
766 |
|
512 |
|
| |
Net attributable earnings |
|
US$m |
|
71.1 |
|
105.1 |
|
83.1 |
|
| |
Capital expenditure |
|
US$m |
|
201.1 |
|
212.0 |
|
107.7 |
|
|
|