Spain

Los Santos Mine

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Categories

Overview

Mine TypeTailings
StatusCare and Maintenance
Commodities
  • Tungsten
Mining Method
  • Truck & Shovel / Loader
Production Start... Lock
SnapshotAlmonty continued its work with third party consultants in evaluating its tailings reprocessing methodology. The tailings recovery rate contained in the technical report assumed no additional modifications will be carried out in the mill processing. However, based on additional testing work carried out by Almonty, the Company decided in February 2020 to implement a planned closure of Daytal’s operations by placing the Los Santos Mine into care and maintenance. The Company is planning to re-open operations in early 2024 once it has finalized plans to modify the plant’s infrastructure. Modifications to the processing plant to facilitate tailings reprocessing are expected to be implemented mid-2023.

Owners

SourceSource
CompanyInterestOwnership
Almonty Industries Inc. 100 % Indirect
Daytal is a wholly owned Spanish subsidiary of Almonty, a corporation governed by the CBCA. The Los Santos mine is 100% owned by Daytal.

Deposit type

  • Skarn

Summary:

Los Santos lies within Lower Palaeozoic sediments in the Central Iberian Tectonic Zone, which forms part of a Europe-wide, Variscan age orogenic belt. The stratigraphy comprises a thick sequence of clastic metasediments, ortho- and para-gneisses, with volcanic andcarbonate formations.

The Los Santos deposit is a typical skarn-hosted scheelite deposit, where intrusion of granitoids into carbonate-rich sedimentary rocks has resulted in their replacement by calcsilicateor siliceous minerals, together with mineralisation.

The deposit has been divided into a number of zones, six of which form the basis of the current project. From west to east these are known as Las Cortinas, Sector Central, Capa East and Los Santos Sur. The strike length varies for each zone and zone dips are fairly uniform across the deposit varying between 60o to 90o.

Within each zone, the skarn mineralisation is located within a number of individual beds, separated by barren lithologies. The major skarn beds vary between 2m and 20m in width; there are, however, numerous thinner bands measuring tens of centimetres.

Within each zone, the skarn mineralisation is located within a number of individual beds, separated by barren lithologies. The major skarn beds vary between 2m and 20m in width; there are, however, numerous thinner bands measuring tens of centimetr.

There are several varieties of skarn mineralisation, economically the most important being the fine to medium grained, equigranular pyroxene skarn with scheelite mineralisation. The pyroxene is predominantly a dark green variety of hedenbergite.

Pyroxene skarn occurs in all zones at Los Santos. It forms from impure Fe-rich carbonates and contains pyroxene, scheelite, plagioclase and locally magnetite. The scheelite is generally fine grained, minus 1mm in size, but individual crystals may exceed 1cm.

At the eastern margin of Las Cortinas, sulphide-rich skarns occur. They are up to 5m thick and several metres in strike length, and comprise massive or semi-massive sulphide horizons with scheelite mineralisation. Sulphides comprise pyrite, arsenopyrite (lollingite), pyrrhotite and chalcopyrite as principal minerals and scheelite, sphalerite, native bismuth, bismuthinite and marcasite as accessories. Wolframite also occurs at Las Cortinas: approximately 6% of the tungsten in this area. There are also some higher amounts of wolframite in sulphide zones in Capa Este.

It has been deduced that the scheelite and pyroxene have crystallized simultaneously, within a high temperature phase. Later, remobilisation has led to amphibole, or apatite as in the talc veins at Las Cortinas. In eastern and western ends of Las Cortinas sector, scheelite and wolframite are associated with massive sulphides, with the following minerals:

• Main minerals: Pyrite, arsenopyrite (and/or lollingite), pyrrhotite and chalcopyrite. Pyrite, arsenopyrite (and/or lollingite), pyrrhotite and chalcopyrite.

• Accessory minerals: Scheelite, pseudo galena, bismuth, bismuthinite, and marcasite.

Two metallogenetic stages have been recognized, the first one of As-W in which arsenopyrite, scheelite and pyrite have been deposited. Later, a breccification phase has taken place in which these minerals have been fractured and, through the fissures and hollows, the other minerals of the paragenesis have been introduced: pyrrhotite, chalcopyrite, pseudo galena, bismuth and bismuthinite.

Reserves

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Mining Methods

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Comminution

Crushers and Mills

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Processing

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Production

CommodityUnits201720162015
All production numbers are expressed as WO3 in concentrate.

Operational metrics

Metrics20222021202020192018201720162015
Plant annual capacity  ....  Subscribe  ....  Subscribe  ....  Subscribe500,000 t500,000 t
Ore tonnes mined  ....  Subscribe  ....  Subscribe  ....  Subscribe455,968 t519,803 t525,219 t
Tonnes milled  ....  Subscribe  ....  Subscribe  ....  Subscribe521,827 t522,782 t518,765 t

Production Costs

CommodityUnits2017
Cash costs WO3 USD 226 / mtu  

Financials

Units202220212020201920182017
Capital expenditures M  ....  Subscribe  ....  Subscribe 0.7  CAD 0.6  CAD 5.3  CAD
Revenue M  ....  Subscribe 19  CAD 27.9  CAD 15.9  CAD
Operating Income M  ....  Subscribe  ....  Subscribe  ....  Subscribe 9.9  CAD 2  CAD 0  CAD
Pre-tax Income M  ....  Subscribe  ....  Subscribe  ....  Subscribe 6.2  CAD -2.4  CAD -3.9  CAD

Heavy Mobile Equipment

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Personnel

Mine Management

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Aug 17, 2023
....................... Subscription required ....................... Subscription required Subscription required Aug 17, 2023

EmployeesYear
...... Subscription required 2022
...... Subscription required 2021
...... Subscription required 2020
...... Subscription required 2019
...... Subscription required 2018
...... Subscription required 2017

Aerial view:

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