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Mittwoch, 11.12.2019 13:30 von PR Newswire | Aufrufe: 184

Pan American Silver Estimates Initial Mineral Resource of 72.5 million tonnes for the La Colorada Skarn Deposit

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PR Newswire

VANCOUVER, Dec. 11, 2019

VANCOUVER, Dec. 11, 2019 /PRNewswire/ - Pan American Silver Corp. (NASDAQ: PAAS) (TSX: PAAS) ("Pan American", or the "Company") today announces an initial mineral resource estimate for the large polymetallic deposit discovered in 2018 at the Company's La Colorada mine in Zacatecas, Mexico. The inferred mineral resource totals 72.5 million tonnes, averaging 44 grams per tonne of silver, 0.17% copper, 2.02% lead and 4.40% zinc, assuming a cut off value of US$60 per tonne after accounting for transportation, smelting and refining costs. The deposit remains open in nearly all directions for resource expansions.

"The initial inferred mineral resource estimate containing 102 million ounces of silver and a large volume of base metals indicates the significance of this new discovery," said Christopher Emerson, Pan American's Vice President Business Development and Geology. "In just over a year since we first announced the discovery, we have completed 54,000 metres of drilling into the deposit and developed the geological model for this initial resource estimate. An aggressive drilling program is planned for 2020 to further explore the deposit's potential."

Highlights

Initial inferred resource of 72.5 million tonnes with grades averaging 44 g/t silver, 0.17% copper, 2.02% lead and 4.40% zinc containing 102 million ounces of silver, 3.2 million tonnes of zinc, 1.5 million tonnes of lead, and 121 thousand tonnes of copper using a cut-off value of US$60 per tonne after accounting for the cost of transportation, smelting and refining.
The majority of the mineralization is contained within a larger polymetallic mineralized skarn covering an area measuring 500 metres by 600 metres. The deposit, as currently defined, is located between 600 metres to 1,700 metres below surface and east of the current La Colorada mine workings.
65 diamond drillholes with a total length of 54,000 metres were used for the geological interpretation and the inferred resource estimate.
Initial laboratory bench-scale metallurgical testing of individual diamond drill core composite samples indicates encouraging selective polymetallic flotation recoveries generating high quality silver-rich copper, lead and zinc mineral concentrates.
For further information on sample results, see our news release dated October 30, 2019.

To view cross sections, plan and images of the mineralized core, please see our website at panamericansilver.com

Michael Steinmann, President and CEO commented: "This initial resource estimate is a very exciting development for Pan American Silver and our La Colorada operation. The substantial size and grades point to a world-class deposit, discovered with our near-site exploration program. We are planning to continue our drilling program, advance early stage engineering and complete further metallurgical testing, with the aim of defining the potential development of a new, large mine for Pan American Silver."

In 2020, Pan American plans to invest US$10 million to drill 44,000 metres, focusing on infill and exploration drilling to further define, expand and add confidence to the inferred resource.

Mineral Resource Estimate Details

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Classification	Cut-off	Tonnes	Ag	Cu	Pb	Zn
	US$/tonne	millions	g/t	%	%	%
Inferred	60	72.5	44	0.17	2.02	4.40

Sensitivity of the Mineral Resource Estimate at Different Cut-off Values

Cut-off	Tonnes	Ag	Cu	Pb	Zn	Ag	Cu	Pb	Zn
US$/tonne	millions	g/t	%	%	%	Moz	kt	Mt	Mt
50	81.5	41	0.16	1.88	4.13	109	130	1.5	3.4
60	72.5	44	0.17	2.02	4.40	102	121	1.5	3.2
70	63.6	46	0.17	2.18	4.70	94	111	1.4	3.0
80	55.0	49	0.18	2.35	5.02	86	100	1.3	2.8

Notes:

CIM definition standards were followed for the estimation of mineral resources.
Mineral resources are not mineral reserves and have no demonstrated economic viability.
Prices used to estimate mineral resources were: US$18.50 per ounce of silver, US$2,600 per tonne of zinc, US$2,200 per tonne of lead, and US$6,500 per tonne of copper.
The mineral value per tonne was estimated using metallurgical recoveries of 91% Ag, 90% Pb, 85% Zn and 38% Cu, with mineral concentrate qualities from the testing at 60% Pb in lead concentrate, 55% Zn in zinc concentrate and 22% Cu in copper concentrate. The mineral value per tonne also includes estimates for transport and refining/selling costs based on experience and long-term views of the marketing, treating and refining of these types of mineral concentrates.
The mineral resource estimate is undiluted and mining parameters have not been applied.
Three million tonnes from the skarn deposit was included as inferred resources in Pan American's mineral resource and reserve estimates effective June 30, 2019.
Totals may not add up due to rounding.
This mineral resource estimate was prepared under the supervision of, or was reviewed by, Christopher Emerson, FAusIMM, Vice President Business Development and Geology and Martin G. Wafforn, P.Eng., Senior Vice President Technical Services and Process Optimization, each of whom is a Qualified Person as that term is defined in National Instrument 43-101 ("NI 43-101").
The effective date of the mineral resources estimate is December 11, 2019.

General Notes with Respect to Technical Information
A total of 65 diamond drillholes with a total length of 54,000 metres were used in the geological interpretation and resource estimate. Drilling of the skarn deposit has been completed from both surface and underground drilling.

All drill hole samples used in the mineral resource estimate have been previously reported in news releases dated October 23, 2018, February 21, 2019, May 8, 2019, August 1, 2019 and October 30, 2019. The drill hole samples were prepared by the internal La Colorada mine laboratory, SGS of Durango, Activation Laboratories Ltd ("Actlabs") of Zacatecas and Bureau Veritas of Hermosillo. Pan American implements a quality assurance and quality control ("QAQC") program, including the submission of certified standards, blanks, and duplicate samples to the laboratories.

Both Actlabs and SGS used fire assay with gravimetric finish for gold, and acid digestion with ICP finish for silver, lead, zinc, and copper. Bureau Veritas used fire assay with gravimetric finish for gold and by acid digestion with ICP finish for silver, lead, zinc, and copper in their Vancouver, Canada laboratory. The La Colorada mine laboratory, which is operated by our employees, used fire assay with gravimetric finish for gold and silver, and acid digestion with atomic absorption finish for lead, zinc, and copper.

The results of the QAQC samples submitted to SGS, Actlabs, Bureau Veritas, and the La Colorada mine laboratory all demonstrate acceptable accuracy and precision. Some standards, blanks and duplicate failures were associated with analysis conducted at the La Colorada mine laboratory, as reported in the news releases dated October 23, 2018 and May 8, 2019. These failed batches were re-submitted to SGS or Actlabs for analysis.

The Qualified Person is of the opinion that the sample preparation, analytical, and security procedures followed for the samples are sufficient and reliable for the purpose of mineral resource and mineral reserve estimates.

Mineral reserves and resources are as defined by the Canadian Institute of Mining, Metallurgy and Petroleum ("CIM").

Pan American reports mineral resources and mineral reserves separately. Reported mineral resources do not include amounts identified as mineral reserves. Mineral resources that are not mineral reserves have no demonstrated economic viability. No mineral reserves have yet been estimated for the skarn deposit.

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