A NI 43-10 Technical Report on Preliminary Feasibility Study was prepared by SRK Consulting (U.S.), Inc. The Technical Report is based on the updated Mineral Resource and Mineral Reserve estimates for the Marmato Expansion Project with an effective date of March 17, 2020.
Mineral Resources
A total of 1,357 drill holes were used to inform the March 17, 2020 Mineral Resource Estimate (MRE), including historic drilling and more recent drilling completed between the 2019 Preliminary Economic Assessment (PEA) and the 2020 Pre-Feasibility Study (PFS).
Marmato mine Mineral Resource Statement, March 17, 20201
| Area |
Category |
Tonnes (Mt) |
Grade Au (g/t) |
Grade Ag (g/t) |
Contained Au (koz) |
Contained Ag (koz) |
| Upper Zone2,5 (Veins) |
Measured (M) |
2.1 |
5.65 |
27.0 |
387 |
1,853 |
|
Indicated (I) |
9.2 |
4.45 |
18.7 |
1,320 |
5,545 |
|
M&I |
11.4 |
4.67 |
20.2 |
1,707 |
7,397 |
|
Inferred |
4.5 |
3.70 |
15.5 |
532 |
2,224 |
| Upper Zone3,5 (Transition) |
Measured (M) |
0.0 |
0.0 |
0.0 |
0.0 |
0.0 |
|
Indicated (I) |
3.4 |
2.68 |
7.2 |
294 |
785 |
|
M&I |
3.4 |
2.68 |
7.2 |
294 |
785 |
|
Inferred |
0.0 |
1.95 |
3.7 |
2 |
3 |
| Deep Zone4,6 |
Measured (M) |
0.0 |
0.0 |
0.0 |
0.0 |
0.0 |
|
Indicated (I) |
24.7 |
2.63 |
3.6 |
2,085 |
2,870 |
|
M&I |
24.7 |
2.63 |
3.6 |
2,085 |
2,870 |
|
Inferred |
21.9 |
2.32 |
2.1 |
1,639 |
1,506 |
| Marmato Total |
Measured (M) |
2.1 |
5.6 |
27.0 |
387 |
1,853 |
|
Indicated (I) |
37.3 |
3.1 |
7.7 |
3,699 |
9,200 |
|
M&I |
39.4 |
3.2 |
8.7 |
4,086 |
11,053 |
|
Inferred |
26.4 |
2.6 |
4.4 |
2,172 |
3,733 |
Notes:
1 Mineral Resources are reported inclusive of the Mineral Reserve. Mineral resources are not mineral reserves and do not have
demonstrated economic viability. All figures are rounded to reflect the relative accuracy of the estimate. All composites have
been capped where appropriate. The Mineral Resources were estimated by Benjamin Parsons, MSc, MAusIMM #222568 of
SRK, a Qualified Person pursuant to NI 43-101.
2 Upper Mine is defined as the current operating mines from levels 16 through 21 using existing mining methodology (cut and
fill).
3 “Transition Zone” is defined as mining of Deep Zone above an elevation of 950 m (accessed from the current operations) using a
modified longhole stoping method.
4 Deep Zone is defined as mining of Deep Zone below an elevation of 950 m using longhole open stope mining methods.
5 Porphyry and vein mineral resources are reported at a CoG of 1.9 g/t. CoGs are based on a price of US$1,500/oz Au and
gold recoveries of 90% for underground resources without considering revenues from other metals.
6 Deep Zone mineral resources are reported at a CoG of 1.3 g/t. CoGs are based on a price of US$1,500/oz Au and gold recoveries
of 95% for underground resources without considering revenues from other metals.
Source: SRK, 2020
Mineral Reserves
Mineral Reserves were classified using the 2014 CIM Definition Standards. Indicated Mineral Resources were converted to Probable Mineral Reserves by applying appropriate modifying factors to potential mining shapes created during the mine design process. In the same manner, Measured Mineral Resources were converted to Proven Mineral Reserves.
Marmato mine Mineral Reserve Estimate, March 17, 20201
| Area |
Category |
Tonnes (kt) |
Au (g/t) |
Ag (g/t) |
Contained Au (koz) |
Contained Ag (koz) |
| Upper Zone2 (Veins) |
Proven |
762 |
5.01 |
21.80 |
123 |
534 |
|
Probable |
3,049 |
4.20 |
16.85 |
412 |
1,652 |
|
Total |
3,812 |
4.37 |
17.84 |
535 |
2,186 |
| Upper Zone3 (Transition) |
Proven |
40 |
7.63 |
28.16 |
10 |
36 |
|
Probable |
1,293 |
3.43 |
7.92 |
143 |
329 |
|
Total |
1,333 |
3.56 |
8.52 |
152 |
365 |
| Deep Zone4 |
Proven |
- |
- |
- |
- |
- |
|
Probable |
14,556 |
2.85 |
3.84 |
1,333 |
1,799 |
|
Total |
14,556 |
2.85 |
3.84 |
1,333 |
1,799 |
| Marmato total |
Proven |
802 |
5.14 |
22.12 |
133 |
570 |
|
Probable |
18,898 |
3.11 |
6.22 |
1,888 |
3,780 |
|
Total |
19,700 |
3.19 |
6.87 |
2,021 |
4,350 |
Notes:
All figures are rounded to reflect the relative accuracy of the estimates. Totals may not sum due to rounding. Mineral Reserves have been stated on the basis of a mine design, mine plan, and economic model. Mineral Resources are reported inclusive of the Mineral Reserve.
1 Upper Zone Mine Veins reserves are reported using a CoG of 2.23 g/t Au. The Upper Zone Veins CoG calculation assumes a US$1,400/oz Au price, 85% Au metallurgical recovery, US$49.45/t mining cost, US$13.63/t G&A cost, US$12.24/t processing cost, and US$8.96/t royalties. Upper Zone Transition Zone reserves are reported using a CoG of 1.91 g/t Au. The Upper Zone Transition Zone CoG calculation assumes a US$1,400/oz Au price, 95% Au metallurgical recovery, US$46/t mining cost, US$13.63/t G&A cost, US$12.24/t processing cost, and US$8.96/t royalties. Deep Zone reserves are reported using a CoG of 1.61 g/t Au. The Deep Zone CoG calculation assumes a US$1,400/oz Au price, 95% metallurgical recovery, US$42/t mining cost, US$14/t processing cost, US$6.75/t production taxes, US$3/t G&A cost, and US$3/t tailings cost. Note that costs/prices used here may be somewhat different than those in the final economic model. This is due to the need to make assumptions early on for mine planning prior to finalizing other items and using long-term forecasts for the life-of-mine plan.
2 The Upper Zone Veins area is currently mined using cut-and-fill methods. Mining dilution ranging from 20% - 55%, averaging 26%, is included in the reserves using a zero grade for dilution. A mining recovery of 90% is applied to stopes. The Upper Zone Veins Mineral Reserves were estimated by Fernando Rodrigues, BS Mining, MBA, MMSAQP #01405, MAusIMM #304726 of SRK, a Qualified Person.
3 The Upper Zone Transition Zone area will be mined using a modified longhole stoping method. A mining dilution of 7% is included in the reserves using a zero grade for dilution. A mining recovery of 90% is applied to stopes. The Upper Zone Transition Mineral Reserves were estimated by Fernando Rodrigues, BS Mining, MBA, MMSAQP #01405, MAusIMM #304726 of SRK, a Qualified Person.
4 The Deep Zone portion of the Project will be mined by longhole open stoping mining methods. Mining dilution (internal and external) is included in the reserve. Stope dilution is 8%, and a portion of the stope dilution is applied using grade values based on average surrounding block information. A mining recovery of 92.5% is applied to stopes. The Deep Zone Mineral Reserves were estimated by Joanna Poeck, BEng Mining, SME-RM, MMSAQP #01387QP, a Qualified Person.
Source: SRK, 2020