Outlook
Casa Berardi entered its sixth year of commercial operations in 2012, following the re-commencement of operations in November 2006.
2011 Gold Production
Record gold production from Aurizon's 100% owned Casa Berardi mine for the year ended December 31, 2011, totalled 163,845 ounces from the processing of 698,123 tonnes at an average grade of 8.0 grams of gold per tonne. Recoveries for the year averaged 91.3%. Actual gold production was in line with the Company's 2011 guidance of approximately 165,000 ounces and it is anticipated that total cash costs per ounce will be below the Company's guidance of US$535 per ounce for 2011.
Fourth Quarter 2011 Gold Production
Ore processed in the fourth quarter 2011 amounted to 170,283 tonnes at an average grade of 9.1 grams of gold per tonne. Metallurgical recoveries of 92% resulted in gold production of 45,995 ounces in the quarter.
Forecast Gold Production for 2012
It is estimated that Casa Berardi will produce approximately 155,000 - 160,000 ounces of gold in 2012 at an average grade of 7.5 grams of gold per tonne. Average daily ore throughput is estimated at 2,000 tonnes per day, similar to 2011. Mine sequencing in 2012 will result in ore grades that are expected to be approximately 6% lower than those achieved in 2011. Approximately 42% of production will come from Zone 113, 41% from the Lower Inter Zone, and the residual 17% from smaller zones and development material.
Assuming a Canadian/U.S. dollar exchange rate at parity, total cash costs per ounce for the year are anticipated to approximate US$600 per ounce in 2012. Onsite mining, milling and administration costs are expected to average $134 per tonne, up approximately 12% from 2011 projected costs as a result of higher stope preparation costs and longer haulage distances.
As quarterly operating results are expected to fluctuate throughout the year, they will not necessarily be reflective of these full year averages.
Capital expenditures at Casa Berardi, funded from operating cash flow, are estimated to total $80 million in 2012, as a result of three major capital projects: shaft sinking, construction of a paste backfill plant to maximize the extraction of high grade ore from Zone 113 and to allow greater mining flexibility, and continued replacement of mobile equipment. These expenditures are comprised of the following:
| Capital expenditures |
2012 Budget (in millions) |
| Sustaining capital |
$29.2 |
| Shaft deepening |
$16.7 |
| Property, plant & equipment |
$10.4 |
| Paste backfill plant |
$12.0 |
| Tailings pond |
$2.3 |
| Exploration |
$9.4 |
| Total |
$80.0 |
Sustaining capital expenditures at Casa Berardi are budgeted to be $29.2 million and will include continued development of the lower portions of Zone 118 and 123.
In 2012, $16.7 million is budgeted for the deepening of the West Mine production shaft a further 285 metres to provide access to the lower portion of the 113, 118 and 123 Zones. The shaft, currently at a depth of 795 metres, will be extended to approximately 1,080 metres below surface, which will provide access at the 1,010 metre level to develop a drift from the shaft to Zones 118 and 123. The shaft deepening is expected to be completed near the end of 2012 and commissioned by the first quarter of 2013.
Mining equipment replacement and fleet expansion to support the expanded development activities is budgeted at $10.4 million. A further $12.0 million will be invested in the construction of a paste backfill plant and $2.3 million will be invested on raising the tailings pond for future capacity.
|
Q3 2011 |
Q2 2011 |
Q1 2011 |
Q4 2010 |
Q3 2010 |
| Operating results |
|
|
|
|
|
| Tonnes milled |
188,571 |
178,233 |
161,036 |
191,697 |
169,913 |
| Grade - grams/tonne |
7.95 |
8.00 |
6.85 |
6.86 |
6.15 |
| Mill recoveries - % |
92.2% |
90.4% |
90.2% |
88.6% |
89.1% |
| Gold production - ounces |
44,457 |
41,418 |
31,976 |
37,496 |
29,905 |
| Gold sold - ounces |
40,257 |
39,900 |
34,306 |
34,808 |
30,755 |
| Per ounce data - US$(4) |
|
|
|
|
|
| Average realized gold price (i) |
$1,695 |
$1,521 |
$1,392 |
$1,376 |
$1,119 |
| Total cash costs (ii) |
$497 |
$544 |
$621 |
$531 |
$604 |
| Amortization (iii) |
250 |
225 |
238 |
263 |
254 |
| Total production costs (iv) |
$747 |
$769 |
$859 |
$794 |
$858 |
Table footnotes:
(i) Realized gold prices net of realized derivative gains or losses divided by ounces sold.
(ii) Operating costs net of by-product credits, divided by ounces sold, and divided by the average
Bank of Canada Cad$/US$ rate.
(iii) Depreciation and amortization charges.
(iv) Total cash costs plus depreciation and amortization charges.
Casa Berardi Shaft Deepening
In the first quarter of 2011, a contract was awarded for the deepening of the West Mine production shaft from the 760 metre level down to the 1,080 metre level. Deepening the shaft is a component of the overall strategy to have greater mining flexibility in the West Mine.
Shaft deepening commenced in the second quarter and to the end of the third quarter, ramp access from the 880 metre level has resulted in 104 metres of excavation by means of an Alimak raise up to the current shaft bottom, which will allow for accelerated shaft deepening. In addition, 477 metres of horizontal development has been completed. The shaft is expected to be completed towards the end of 2012 and will provide access to the lower portion of Zones 113, 118, and 123 once a drift at the 1,010 metre level is completed in 2013. The estimated cost of the shaft deepening, drift access to Zones 118 and 123, and related infrastructure is approximately $33.5 million. Expenditures during the third quarter totalled $2.8 million and year to date total $6.6 million.
Casa Berardi Exploration
In 2012, $9.4 million will be invested on exploration at Casa Berardi which will include approximately 88,000 metres of surface and underground diamond drilling. Up to 3 surface and 5 - 7 underground drill rigs will be active during the course of 2012. The Company expects to capitalize these costs as the primary objective of the drilling will be to improve the quality of the known reserves and resources as well as exploring for extensions of these structures.
Surface exploration will include testing of the following:
- Eastern extension of the Principal zone
- Northwest extension of the Lower Inter Zone in the West mine
- Extension of Zone 123 at depth
- Southern area of Zone 123 at depth
- Potential of the sourthern area between the Principal and the East mine
- Extension of Zone 160
Underground rigs will primarily focus on definition drilling of the Lower Inter, and Zone 109, 113, 118, and 123. In addition, exploration drilling will be performed on the Principal, 118 and 140 Zones.
Operating Review for 2010
Casa Berardi performed in line with expectations in 2010 despite a revised mine plan resulting from challenging ground conditions in a localized area of Zone 113 and reduced availability of underground mining equipment. Gold production was approximately 6% lower than plan and unit operating costs were 4% higher than plan.
Gold production for the year totalled 141,116 ounces, 11% lower than the 159,261 ounces produced in 2009 as a result of the anticipated sequencing of lower grade ore in 2010. The average ore grade of 6.75 grams per tonne achieved in 2010 matched expectations. Increased daily ore throughput of 1,980 tonnes per day in 2010 compared to 1,887 tonnes per day in 2009 was offset by lower ore grades and mill recoveries, resulting in the decrease in gold production in 2010.
Total cash costs in 2010 were US$541 per ounce, 10% higher than plan and compared to the US$401 per ounce costs in 2009, as lower ore grades, lower mill recoveries, and a strong Canadian dollar impacted costs. Unit operating costs in 2010 were stable on a Canadian dollar basis at $108 per tonne, matching the prior year’s costs as higher ore throughput offset higher mining costs resulting from additional ground support and lower productivity from mining equipment. Operating profit margins increased by 18% to US$604 per ounce from US$514 per ounce in 2009, due to higher realized gold prices.
BBA Inc. (BBA) was commissioned by Aurizon to undertake a prefeasibility study on the Principal Mine open pit. Roscoe Postle Associates Inc. (“RPA”) was commissioned by Aurizon to prepare updated mineral reserve and mineral resource estimates on the rest of the property.
Proven and Probable Mineral Reserves have increased as a result of:
- At the West Mine, the 2010 mine production in Zones 113, Lower Inter, North West and 115 have been more than replaced by gains in mineral reserves primarily from the Principal Zone open pit and Zone 123S. Additional reserve increases were provided from Zones 118 and 109.
- As a result of the addition of the lower grade ore from the Principal Zone open pit, tonnage has increased by 77%, grade has decreased by 19% and ounces of gold have been increased by 44% compared to 2009.
- Mineral reserves are estimated using an average long-term gold price of US$950 per ounce and a US$/C$ exchange rate of 1:1, compared to US$825 per ounce in 2009 and a US$/C$ exchange of 1:1.09. A minimum cut off grade of 4.1 grams of gold per tonne was used for the underground zones, based on long term operating costs and gold prices. A minimum cut off grade of 1.2 grams and 0.5 grams of gold per tonne was used respectively for the East Mine and Principal Zone open pits. In 2009, the minimum cut off grade was 3.9 grams of gold per tonne for the underground zones.
- As the mining industry is currently experiencing gold prices that are higher than US$950 per ounce, the operations periodically mine ore that is not included in mineral reserves as the grades are lower than the long term minimum cut-off grades.
Casa Berardi Reserves and Resources - December 31, 2010
The Casa Berardi gold deposits are located along a five kilometre east-west mineralized corridor. They include the East and West mines, and the Principal Zone. The Casa Berardi gold deposits can be classified as an Archean sedimentary-hosted lode gold deposit. The gold mineralization is superimposed on a continuous graphitic mudrock unit corresponding to the Casa Berardi Fault plane. Gold occurs mainly south of the Casa Berardi Fault, and sometimes on both sides of the fault.
The mine has produced over 1.3 million recovered gold ounces since commencing production in 1986, including 636,400 recovered ounces since Aurizon re-commissioned production in December 2006.
Scott Wilson Roscoe Postle Associates Inc. (Scott Wilson RPA) were commissioned by Aurizon to prepare updated mineral reserve and mineral resource estimates on the different zones of the property, in accordance with the Standards of Disclosure for Mineral Projects as defined by N1 43-101.
Click to enlarge
CASA BERARDI MINE MINERAL RESERVE ESTIMATE As at December 31, |
| |
2010 |
2009 |
| |
Tonnes |
Grade Grams/tonne |
Gold Ounces |
Tonnes |
Grade Grams/tonne |
Gold Ounces |
| Measured Mineral Resources |
|
|
|
|
|
|
| Lower Inter (LI) |
910,000 |
8.0 |
233,200 |
965,000 |
8.6 |
266,100 |
| North West (NW) |
42,000 |
5.8 |
7,900 |
62,000 |
5.6 |
11,200 |
| 113 |
587,000 |
8.8 |
167,000 |
893,000 |
7.7 |
222,000 |
| 115 |
147,000 |
11.4 |
54,100 |
156,000 |
11.3 |
56,400 |
| Principal -- Open Pit |
89,000 |
6.3 |
18,000 |
- |
- |
- |
| East Mine -- Open Pit |
407,000 |
4.2 |
54,400 |
407,000 |
4.2 |
54,400 |
| East Mine Underground |
88,000 |
6.3 |
17,800 |
88,000 |
6.3 |
17,800 |
| Total Proven Reserves |
2,271,000 |
7.6 |
552,400 |
2,571,000 |
7.6 |
627,800 |
| Lower Inter (LI) |
30,000 |
8.2 |
7,900 |
32,000 |
10.2 |
10,500 |
| South West (SW) |
72,000 |
4.6 |
10,700 |
72,000 |
4.6 |
10,700 |
| 109 |
114,000 |
5.7 |
21,000 |
68,000 |
5.4 |
11,700 |
| 111 |
37,000 |
5.4 |
6,400 |
37,000 |
5.4 |
6,400 |
| 113 |
402,000 |
9.9 |
127,000 |
535,000 |
8.2 |
141,200 |
| 115 |
0 |
0.0 |
0 |
2,000 |
4.1 |
300 |
| 117S |
19,000 |
7.0 |
4,300 |
19,000 |
7.0 |
4,300 |
| 118 |
1,021,000 |
6.4 |
208,600 |
767,000 |
6.0 |
148,400 |
| 123S |
493,000 |
7.4 |
117,700 |
- |
- |
- |
| Principal -- Open Pit |
3,072,000 |
3.6 |
352,400 |
- |
- |
- |
| East Mine -- Open Pit |
228,000 |
3.7 |
26,800 |
228,000 |
3.7 |
26,800 |
| East Mine Underground |
63,000 |
8.2 |
16,500 |
63,000 |
8.2 |
16,500 |
| Low-Grade Development |
31,000 |
3.9 |
3,900 |
40,000 |
3.9 |
5,000 |
| Total Probable Reserves |
5,583,000 |
5.0 |
904,100 |
1,862,000 |
6.4 |
382,000 |
| Total Proven & Probable Reserves |
7,854,000 |
5.8 |
1,457,000 |
4,433,000 |
7.1 |
1,010,000 |
Notes:
- Open pit mineral reserves were estimated by BBA and underground mineral reserves were audited by RPA.
- Mineral reserves and resources estimates have been completed in accordance with the Standards of Disclosure
for Mineral Projects as defined by National Instrument 43-101. Mineral resources are exclusive of mineral
reserves. Mining depletion for 2010 is included in 2010 Mineral reserves.
- Mineral Reserves are estimated at a cut-off grade of 4.15 g/t Au for underground, and 1.2 g/t Au for East Mine
open pit and 0.5 g/t Au for Principal open pit.
- Mineral Reserves are estimated using an average long-term gold price of US$950 per ounce and a
US$/C$ exchange rate of 1:1.
- A minimum mining width of three metres was used.
- Totals may not represent the sum of the parts due to rounding.
- pit mineral reserves were estimated by BBA and underground mineral reserves were audited by RPA.
Note: An updated resource estimate for the Principal area has been completed in 2010 to incorporate results from a winter drill program. Refer to the Casa Berardi Exploration section.
CASA BERARDI MINE MINERAL RESOURCE ESTIMATE As at December 31, |
| |
2010 |
2009 |
| |
Tonnes |
Grade Grams/tonne |
Gold Ounces |
Tonnes |
Grade Grams/tonne |
Gold Ounces |
| Measured Mineral Resources |
|
|
|
|
|
|
| Lower Inter (LI) |
122,000 |
5.1 |
19,800 |
98,000 |
5.1 |
16,200 |
| 113 |
290,000 |
6.6 |
61,300 |
155,000 |
8.1 |
40,100 |
| 113-5 |
10,000 |
5.7 |
1,900 |
- |
- |
- |
| 115 |
9,000 |
4.9 |
1,500 |
- |
- |
- |
| 115-2 |
34,000 |
12.2 |
13,200 |
- |
- |
- |
| North West |
9,000 |
5.0 |
1,400 |
9,000 |
5.0 |
1,400 |
| Principal Underground |
153,000 |
7.3 |
36,000 |
- |
- |
- |
| East Mine -- Open Pit |
311,000 |
3.1 |
31,300 |
311,000 |
3.1 |
31,300 |
| East Mine Underground |
216,000 |
6.5 |
45,500 |
216,000 |
6.5 |
45,500 |
| Total Measured Resources |
1,155,000 |
5.7 |
211,900 |
789,000 |
5.3 |
134,500 |
| Indicated Mineral Resources |
|
|
|
|
|
|
| Lower Inter (LI) |
3,000 |
8.8 |
900 |
3,000 |
5.3 |
600 |
| South West (SW) |
300,000 |
4.7 |
45,000 |
300,000 |
4.7 |
45,000 |
| Inter |
124,000 |
4.4 |
17,700 |
124,000 |
4.4 |
17,700 |
| 109 |
21,000 |
4.3 |
2,900 |
- |
- |
- |
| 111 |
52,000 |
5.2 |
8,800 |
52,000 |
5.2 |
8,800 |
| 113 |
46,000 |
5.1 |
7,600 |
60,000 |
4.9 |
9,500 |
| 113-5 |
2,000 |
6.0 |
400 |
- |
- |
- |
| 113(S4) |
245,000 |
5.5 |
43,000 |
245,000 |
5.5 |
43,000 |
| 115 |
- |
- |
- |
- |
- |
- |
| 115-2 |
4,000 |
10.3 |
1,300 |
- |
- |
- |
| 118 |
518,000 |
5.2 |
86,900 |
265,000 |
6.0 |
51,800 |
| 123S |
136,000 |
5.4 |
23,700 |
- |
- |
- |
| Principal -- Open Pit |
- |
- |
- |
1,785,000 |
6.2 |
355,300 |
| Principal Underground |
1,257,000 |
7.4 |
298,500 |
837,000 |
6.4 |
171,700 |
| East Mine -- Open Pit |
404,000 |
2.7 |
34,500 |
404,000 |
2.7 |
34,500 |
| East Mine Underground |
90,000 |
6.3 |
18,100 |
90,000 |
6.3 |
18,100 |
| 152 |
125,000 |
5.8 |
23,200 |
125,000 |
5.8 |
23,200 |
| Total Indicated Resources |
3,327,000 |
5.7 |
612,400 |
4,289,000 |
5.6 |
778,100 |
| Total Measured & Indicated Resources |
4,481,000 |
5.7 |
824,300 |
5,078,000 |
5.6 |
912,600 |
CASA BERARDI MINE MINERAL RESOURCE ESTIMATE As at December 31, |
| |
2010 |
2009 |
| |
Tonnes |
Grade Grams/tonne |
Gold Ounces |
Tonnes |
Grade Grams/tonne |
Gold Ounces |
| Measured Mineral Resources |
|
|
|
|
|
|
| 104 |
115,000 |
6.6 |
24,500 |
115,000 |
6.6 |
24,500 |
| 113 (S4) |
15,000 |
5.8 |
2,700 |
15,000 |
5.8 |
2,700 |
| 118 |
369,000 |
7.9 |
94,200 |
1,018,000 |
6.8 |
222,100 |
| 123S |
909,000 |
8.0 |
234,100 |
714,000 |
9.4 |
216,300 |
| Principal - Open Pit |
655,000 |
2.5 |
53,200 |
841,000 |
6.0 |
161,500 |
| Principal Underground |
628,000 |
6.6 |
132,700 |
836,000 |
6.0 |
160,500 |
| East Mine -- Open Pit |
310,000 |
3.0 |
30,200 |
310,000 |
3.0 |
30,200 |
| East Mine Underground |
156,000 |
9.1 |
45,600 |
156,000 |
9.1 |
45,600 |
| 152 |
13,000 |
8.2 |
3,500 |
13,000 |
8.2 |
3,500 |
| East Mine Cherty |
225,000 |
6.8 |
49,300 |
225,000 |
6.8 |
49,300 |
| 160 In Pit Resources |
131,000 |
1.7 |
7,100 |
- |
- |
- |
| 160 Underground |
455,000 |
4.8 |
70,800 |
243,000 |
5.4 |
42,200 |
| Total Inferred Resources |
3,981,000 |
5.8 |
747,900 |
4,487,000 |
6.6 |
958,500 |
Notes:
1. Open pit mineral resources were estimated by BBA and underground mineral resources were estimated by RPA.
2. CIM definitions were followed for Mineral Resources.
3. Mineral Resources are estimated at cut-off grades of:
• 4 g/t Au for West Mine, Principal Mine and East Mine.
• 3 g/t Au for South West, Inter and 104 zones in the West Mine. Those zones were estimated by Aurizon in 2000 using 2D polygons on longitudinal sections and reviewed by RPA in 2005.
• 1.30 g/t Au for the East Mine – Open Pit
• 0.5g/t Au for the Principal – Open Pit Mineral Resources are estimated using an average long-term gold price of US$950 per ounce, and a US$/C$ exchange rate of 1:1.
4. Minimum mining widths of two to three metres were used.
5. Mineral Resources are exclusive of Mineral Reserves.
6. Totals may not represent the sum of the parts due to rounding.
7. Mineral resources which are not mineral reserves do not have demonstrated economic viability