Yaurichocha Mine

Yauricocha is our flagship operation with over 70 years of continuous production

As of December 31, 2018

Contribution
to Total Revenue
Revenue Mix
By Metal in 2018
Zinc Equivalent Pounds
Produced in 2018 (000s)
157,151
All-in-Sustaining Cost
(per zinc equivalent pound sold)
$0.86

Quick Facts

Location Peru
Ownership 82%
Type of Mine Underground
Mining Methodology Sub-level caving, cut and fill
Processing Method Crushing and grinding, floatation
Milling/Processing Capacity 3,150
Number of Employees & Contractors 759 (FT), 1,577 (Contract)
Zinc Eq Production (000’s) - guidance for 2019 163,884 - 183,478 pounds
Cash Costs - guidance for 2019 $0.58/pound sold
AISC - guidance for 2019 $0.88/pound sold

Reserves & Resources

On November 13, 2017, the Company released an updated NI 43-101 compliant reserve and resource estimate for the Yauricocha Mine, completed by SRK Consulting Inc. of Denver, Colorado.

Category Tonnes
(x1000)
Ag
(g/t)
Cu
(%)
Pb
(%)
Zn
(%)
Au
(g/t)
ZnEq
(%)
ZnEq
(M lb)
Reserves
Proven 1,836 46.6 1.08 0.84 2.59 0.64 5.78 234
Probable 7,081 48.8 1.23 0.75 2.38 0.49 5.72 893
Proven & Probable 8,917 48.3 1.20 0.77 2.43 0.52 5.73 1,127
Resources
Measured 3,094 70.0 1.72 1.23 3.20 0.79 8.06 550
Indicated 10,112 59.9 1.46 0.83 2.67 0.60 6.63 1,478
Measured & Indicated 13,206 62.3 1.52 0.92 2.79 0.65 6.97 2,028
Inferred 6,632 43.0 1.19 0.47 2.16 0.55 5.15 753

Notes:

  • The effective date of the mineral reserve and resource estimate is July 31, 2017.
  • Details of the estimate are provided in the Company’s September 28, 2017 press release and within a NI 43-101 compliant technical report filed on SEDAR on November 13, 2017. Silver/copper equivalent is based on the following metal price assumptions: US$17.80/oz Ag, US$2.60/lb Cu, US$1.01/lb Pb and US$1.25 Zn and US$1,255/oz Au. Metallurgical recovery assumptions are based on Yauricocha actual plant data for 2017 and are 67% Ag, 65% Cu, 85% Pb, 89% Zn, 16% Au. The equivalency expression is designed to present an in-situ silver equivalent, considering the recovered value of the other metals expressed in the value of silver g/t.
    The equation is: AgEq=((Ag*Ag$*Agrec)+(Cu*Cu$*Curec)+(Pb*Pb$*Pbrec)+(Zn*Zn$*Znrec)+(Au*Au$*Aurec))/(Ag$*Agrec).
  • Measured and Indicated Resources include Proven and Probable Reserves.
  • Mineral resources that are not mineral reserves do not have demonstrated economic viability.

Through its wholly owned subsidiary, Dia Bras Peru S.A.C., Sierra Metals acquired 82% of Minera Corona, S.A. ("Corona") in May of 2011. Corona owns 100% of the Yauricocha Mine. Yauricocha, is an underground mine located in western central Peru in the Yauyos province, approximately 12 km west of the Continental Divide. The Yauricocha property covers 18,778 hectares that straddle a 20 km strike length of the prolific Yauricocha fault, a major ore controlling structure in this part of western central Peru. The mine is at an average altitude of 4,600 meters and has been producing for more than 68 years. Ore is processed at the on-site Chumpe plant using a combination of crushing, grinding and flotation and is permitted to produce at a rate of 3,150 tonnes per day, which is expected to increase to 3,600 tonnes per day during 2019 upon receipt of the ITS permit. A preliminary economic assessment released in June 2018, studies increasing production to 5,500 tonnes per day in 2021.

The ore is treated in two separate circuits and is extracted from three different types of deposits which include the following:

  • A polymetallic deposit, containing silver, lead, zinc, copper, and gold
  • A lead oxide deposit, containing lead, silver and gold
  • A copper oxide deposit, containing copper, silver, lead and gold

Exploration

Peru is one of the most prolific polymetallic producing regions of the world. Sierra Metals controls a large area of prospective claims, exceeding 50,000 hectares of mining claims within the country.

The exploration program has the following goals:

  • Brownfield programs within and close to existing mines to exploit near mine targets that can be converted into resources and reserves and brought into the existing mine plans within a shorter period of time
  • Developing a pipeline of open pit and underground opportunities through a district scale study that incorporates various geological data layers, historical drill hole and mine data