Summary of Parral Project Resource Estimate as of December 31, 2011
| Resource Category |
Thousand Tonnes |
Ag (g/t) |
Au (g/t) |
Ag Oz |
Au Oz |
Cu (%) |
Pb (%) |
Zn (%) |
NSR/Tonne ($US) |
|---|---|---|---|---|---|---|---|---|---|
| Indicated | 1,631.0 | 49 | 0.90 | 2,589,900 | 47,200 | 0.15 | 2.87 | 2.86 | 75.38 |
| Inferred | 1,303,000 | 63 | 0.88 | 2,659,000 | 36,900 | 0.20 | 2.55 | 2.28 | 73.77 |
Notes:
- Reserve cut-off at Guanacevi is 158 g/t Ag
- Reserve cut-off at Guanajuato is 111 g/t Ag
- Mining width is 2.0 meters
- Dilution is 15% after it has been diluted to a minimum mining width if required
- Resource cut-off for the Guanacevi and Guanajuato projects is 100 Ag eq
- Reserve and Resource Silver equivalent is 55:1 for Silver to Gold
- At the Parral project a cut-off using NSR of $40 is used with the prices listed below
- The cut-off used for Arroyo Seco was 100 g/t Ag
Because the Parral Project resources are poly-metallic, each sample interval was assigned a value based on the net smelter return (NSR). Gold and silver prices were based on Endeavour's base case model for 2010 and zinc and lead prices were as of July 2010. Metallurgical recoveries were derived from Endeavour's metallurgical lab test-work to date. The NSR parameters were as follows:
| Net Smelter Return (NSR) Cut-off Parameters for Parral Project Resources | |
|---|---|
| Gold Price | US $1,000 per oz |
| Silver Price | US $16 per oz |
| Lead Price | US $0.65 per lb |
| Zinc Price | US $0.65 per lb |
| Gold Recovery (Overall) | 75% |
| Silver Recovery (Overall) | 71% |
| Lead Recovery (Overall) | 80% |
| Zinc Recovery (Overall) | 74% |
| Smelter Terms | Based on generic contract |
