|
|
 |
|
Reserves and Resources
Proven and probable mineral reserves were determined
at a $650 price. Gold recovery by heap leach is estimated at 56.6%
for both proven and probable reserves. Drill spacing for proven
reserves is 120 feet or less, and for probable reserves is between 120
and 240 feet.
Mineral Reserve & Resource
December 31, 2009
The results are summarized in the following table:
|
Proven & Probable Oxide Mineral Reserves
|
| |
|
Grade (opt) |
Contained Ounces (000's) |
|
Tons (000's) |
Au |
Ag |
Au |
Ag |
| Proven & Probable |
|
|
|
|
|
| Proven |
145,950 |
0.014 |
0.20 |
2,054 |
28,668 |
| Probable |
31,278 |
0.012 |
0.12 |
390 |
3,602 |
| Total Proven & Probable |
177,228 |
0.014 |
0.18 |
2,444 |
32,270 |
i.
Rounding differences may occur
ii.
See “Notes to the 2010 Mineral Reserve and Resource Estimate”.
iii.Within the designed 0.008 opt resource pit, reserves were reported at a 0.005 opt internal
cutoff grade.
|
Combined Oxide & Sulfide – Measured & Indicated Mineral Resources
(inclusive of reserves)
Cutoff grade – Oxide 0.008 opt Eq, Sulfide 0.018 opt AuEq |
|
|
|
|
Grade (opt) |
Contained Ounces (000's) |
|
Tons (000's) |
Au |
Ag |
Au |
Ag |
| Measured Resources |
|
|
|
|
|
| Au & Ag Measured |
81,210 |
0.015 |
0.57 |
1,243 |
46,067 |
| Au measured, Ag inferred |
106,956 |
0.013 |
- |
1,439 |
- |
| Total Measured |
188,166 |
0.014 |
0.43 |
2,682 |
46,067 |
| |
|
|
|
|
|
| Indicated Resources |
|
|
|
|
|
| Au & Ag Indicated |
231,947 |
0.014 |
0.60 |
3,319 |
138,117 |
| Au Indicated, Ag inferred |
90,805 |
0.012 |
- |
1,077 |
- |
| Total Measured |
322,752 |
0.014 |
0.43 |
4,396 |
138,117 |
| |
|
|
|
|
|
| Measured & Indicated Resources |
|
|
|
|
|
| Au & Ag Measured & Indicated |
313,158 |
0.015 |
0.59 |
4,562 |
184,184 |
| Au M & I, Ag inferred |
197,760 |
0.013 |
- |
2,516 |
- |
| Total Measured & Indicated |
510,918 |
0.014 |
0.36 |
7,078 |
184,184 |
i.
Rounding differences may occur
ii.
See “Notes to the 2010 Mineral Reserve and Resource Estimate”.
iii. A portion of the gold measured and indicated resource does not currently have sufficient data
to report silver measured and indcated resources, and those silver ounces have been included in
the inferred category. As such, a zero value grade for silver has been assigned for those tons
where only measured and indicated gold ounces have been reported, which negatively affects the
average silver grade for measured and indicated resources.
|
Combined Oxide & Sulfide Inferred Mineral Resources
Cutoff grade – Oxide 0.008 opt AuEq, Sulfide 0.018 opt AuEq |
| |
|
Grade (opt) |
Contained Ounces (000's) |
|
Tons (000's) |
Au |
Ag |
Au |
Ag |
| Inferred Resources |
|
|
|
|
|
Ag inferred resource associated
with M&I Au
Au & Ag Inferred |
297,667 |
0.014 |
0.56 |
3,933 |
58,605
157,683 |
| Total Inferred |
|
|
|
3,933 |
216,288 |
i. Rounding differences may occur
ii.
See “Notes to the 2010 Mineral Reserve and Resource Estimate” included in this press release.
|
Notes To The 2010 Mineral Reserve And Resource Estimate
- Scott Wilson of Scott E. Wilson Consulting, Inc. is a Certified
Professional Geologist and member of the American Institute of
Professional Geologists in Denver, Colorado, and is a Qualified Person
as defined by NI 43‐101. Scott is the independent resource estimate
consultant for Allied Nevada Gold Corp. and has reviewed the technical
information contained in this press release.
- Scott E. Wilson Consulting, Inc. has recommended an ordinary kriging
estimate as the preferred method of determining the resource estimate.
Inferred resource calculations are based on 25 foot drill hole
composites of 5 foot sample intervals. All estimates are based on a
block dimension of 50 feet long x 50 feet wide x 25 feet tall with the
estimation parameters determined by variography.
- Mineral resources that are not mineral reserves do not have demonstrated
economic viability. The estimate of mineral resources may be materially
affected by the inability to obtain required environmental and other
regulatory approval, environmental or operating permits. The estimate
may also be materially affected by global economic conditions such as
the price of gold and silver, the price of oil and other commodities
utilized in the production of gold and silver. Unknown geologic or
hydrologic conditions or other unknown factors may materially affect the
resource estimates.
- A different processing method and plant, and all associated regulatory
approvals, are required to recover gold and silver from sulfide
mineralization.
- Gold equivalent cutoff grades were calculated using a gold price of $800
per ounce and $14.00 per ounce for a gold to silver ratio of 57.14:1.
- Estimates of mineral reserves and resources may be materially affected
by environmental permitting, legal and other relevant issues.
The following tables present a more detailed breakdown of the Oxide Resources (inclusive of reserves) and Sulfide Resources:
Oxide Measured & Indicated Mineral Resources
(inclusive of reserves)
Cutoff grade – Oxide 0.008 opt AuEq |
|
|
|
|
Grade (opt) |
Contained Ounces (000's) |
|
Tons (000's) |
Au |
Ag |
Au |
Ag |
| Measured Resources |
|
|
|
|
|
| Au & Ag Measured |
54,794 |
0.014 |
0.42 |
767 |
22,794 |
| Au measured, Ag inferred |
94,749 |
0.013 |
- |
1,232 |
- |
| Total Measured |
149,543 |
0.013 |
0.15 |
1,999 |
22,794 |
| |
|
|
|
|
|
| Indicated Resources |
|
|
|
|
|
| Au & Ag Indicated |
142,219 |
0.012 |
0.41 |
1,756 |
58,409 |
| Au Indicated, Ag inferred |
75,229 |
0.011 |
- |
828 |
- |
| Total Measured |
217,448 |
0.012 |
0.27 |
2,584 |
58,409 |
| |
|
|
|
|
|
| Measured & Indicated Resources |
|
|
|
|
|
| Au & Ag Measured & Indicated |
197,013 |
0.013 |
0.41 |
2,524 |
81,203 |
| Au M & I, Ag inferred |
169,978 |
0.012 |
- |
2,059 |
- |
| Total Measured & Indicated |
366,991 |
0.013 |
0.22 |
4,583 |
81,203 |
| |
|
Grade (opt) |
Contained Ounces (000's) |
|
Tons (000's) |
Au |
Ag |
Au |
Ag |
| Inferred Resources |
|
|
|
|
|
Ag inferred resource associated
with M&I Au
Au & Ag Inferred
Crofoot Pad |
95,510
35,353 |
0.011
0.009 |
0.33
0.00 |
1,067
318 |
40,833
31,111
- |
| Total Inferred |
|
|
|
1,385 |
71,944 |
Sulfide Measured & Indicated Mineral
Resources
Cutoff grade – 0.018 opt AuEq |
|
|
|
|
Grade (opt) |
Contained Ounces (000's) |
|
Tons (000's) |
Au |
Ag |
Au |
Ag |
| Measured Resources |
|
|
|
|
|
| Au & Ag Measured |
26,416 |
0.018 |
0.88 |
475 |
23,273 |
| Au measured, Ag inferred |
12,207 |
0.017 |
- |
208 |
- |
| Total Measured |
38,623 |
0.018 |
0.60 |
683 |
23,273 |
| |
|
|
|
|
|
| Indicated Resources |
|
|
|
|
|
| Au & Ag Indicated |
89,728 |
0.017 |
0.89 |
1,563 |
79,708 |
| Au Indicated, Ag inferred |
15,576 |
0.016 |
- |
249 |
- |
| Total Measured |
105,304 |
0.017 |
0.76 |
1,812 |
79,708 |
| |
|
|
|
|
|
| Measured & Indicated Resources |
|
|
|
|
|
| Au & Ag Measured & Indicated |
116,144 |
0.018 |
0.89 |
2,038 |
102,981 |
| Au M & I, Ag inferred |
27,783 |
0.016 |
- |
457 |
- |
| Total Measured & Indicated |
143,927 |
0.018 |
0.72 |
2,495 |
102,981 |
| |
|
Grade (opt) |
Contained Ounces (000's) |
|
Tons (000's) |
Au |
Ag |
Au |
Ag |
| Inferred Resources |
|
|
|
|
|
Ag inferred resource associated
with M&I Au
Au & Ag Inferred
|
148,804 |
0.017 |
0.85 |
2,548 |
17,771
126,572 |
| Total Inferred |
|
|
|
2,548 |
144,343 |
|
|
|
|
|
