Atalaya Mining PLC Announces Filing of Proyecto Riotinto Technical Report
Report covers the entire Riotinto property including the San Dionisio and San Antonio deposits
NICOSIA, October 5, 2022 - Atalaya Mining plc ("Atalaya" or "the Company") (AIM:ATYM)(TSX:AYM) is pleased to announce the filing on SEDAR of a technical report on Proyecto Riotinto which is dated September 2022 (the "Technical Report") and prepared in accordance with National Instrument 43-101 ("NI 43-101"). The Technical Report includes independent Mineral Resource Estimates for the Company's San Dionisio and San Antonio deposits, which form part of Proyecto Riotinto and are located adjacent to the Company's operating Cerro Colorado open pit and 15 Mtpa processing plant.
The Technical Report is entitled "Technical Report on the Riotinto Copper Project - Located in Huelva Province, Spain" and is available under the Company's profile on SEDAR at www.sedar.com and on the Company's website at www.atalayamining.com.
San Dionisio Mineral Resource Estimation Details
The drilling data used for mineral resource estimation was based on 1,003 drillholes over 83,554 metres, of which 45 holes over 16,991 metres were completed by Atalaya between 2015-2021, while the remainder by past operators.
The Mineral Resource model was created as a three-dimensional block model using Datamine Studio RM software. The model block size is 10x10x10 metres, which is consistent with the estimated mining bench height and the estimated selective mining unit. The horizontal extent of the model is defined to cover the San Dionisio deposit, plus sufficient space outside the deposit to cover the ultimate pit.
San Dionisio Mineral Resource Estimate (December 2021)
Table 1: San Dionisio Open Pit - Total
| San Dionisio Open Pit - Total Mineral Resource | |||||||||||
| % Cu | Grade | Contained Metal | |||||||||
| cut-off | Class | Mt | Cu % | Zn % | Pb % | Cu kt | Zn kt | Pb kt | |||
| 0.15 (Base Case) | Measured | 49.7 | 0.94 | 1.11 | 0.22 | | 466 | 552 | 107 | ||
| Indicated | 6.4 | 0.71 | 1.33 | 0.35 | | 46 | 86 | 23 | |||
| M+I | 56.1 | 0.91 | 1.14 | 0.23 | 511 | 638 | 130 | ||||
| Inferred | 0.8 | 0.78 | 0.55 | 0.23 | | 7 | 5 | 2 | |||
Notes: July 2021 Model (21G) - 31 Dec 2020 Topo - $3.60/lb Cu Pit; totals may not sum due to rounding
Table 2: San Dionisio Open Pit - By Ore Type
| San Dionisio Open Pit - Copper Resource (MinZ & Zone2a) | |||||||||||
| % Cu | Grade | Contained Metal | |||||||||
| cut-off | Class | Mt | Cu % | Zn % | Pb % | Cu kt | Zn kt | Pb kt | |||
| 0.15 (Base Case) | Measured | 27.0 | 0.78 | 0.28 | 0.06 | | 212 | 75 | 17 | ||
| Indicated | 2.0 | 0.66 | 0.18 | 0.04 | | 13 | 4 | 1 | |||
| M+I | 29.0 | 0.78 | 0.27 | 0.06 | 225 | 78 | 18 | ||||
| Inferred | 0.4 | 0.95 | 0.19 | 0.03 | | 4 | 1 | 0 | |||
| | | | |||||||||
| San Dionisio Open Pit - Polymetallic Resource (Contact & MS) | |||||||||||
| % Cu | Grade | Contained Metal | |||||||||
| cut-off | Class | Mt | Cu % | Zn % | Pb % | Cu kt | Zn kt | Pb kt | |||
| 0.15 (Base Case) | Measured | 22.6 | 1.12 | 2.11 | 0.40 | | 253 | 477 | 90 | ||
| Indicated | 4.4 | 0.73 | 1.85 | 0.49 | | 32 | 82 | 22 | |||
| M+I | 27.0 | 1.06 | 2.07 | 0.41 | 286 | 559 | 112 | ||||
| Inferred | 0.4 | 0.62 | 0.91 | 0.43 | | 3 | 4 | 2 | |||
Notes: July 2021 Model (21G) - 31 Dec 2020 Topo - $3.60/lb Cu Pit; totals may not sum due to rounding
Table 3: San Dionisio Underground
| San Dionisio Underground - Total Mineral Resource | |||||||||||
| Grade | Contained Metal | ||||||||||
| Mt | Cu % | Zn % | Pb % | Cu kt | Zn kt | Pb kt | |||||
| Inferred Resource | | 12.4 | 1.01 | 2.54 | 0.62 | | 125 | 315 | 76 | ||
Notes: July 2021 Model (21G); totals may not sum due to rounding
San Antonio Mineral Resource Estimation Details
The drilling data used for resource estimation was based on 185 drillholes over 18,305 metres, of which 8 holes over 1,504 metres were completed by Atalaya, while the remainder by past operators.
The Mineral Resource model for the mineralised zone of San Antonio was created as a three-dimensional block model using Datamine Studio RM software. The model block size is 2x2x2 metres, which is used to more accurately define the geometry of the deposit. The horizontal extent of the model is defined to cover the San Antonio deposit and the adjacent Planes deposit, plus sufficient space outside the deposit for mine planning.
San Antonio Mineral Resource Estimate (December 2021)
Table 4: San Antonio Underground
| San Antonio Underground - Total Mineral Resource | |||||||||||
| Grade | Contained Metal | ||||||||||
| Mt | Cu % | Zn % | Pb % | Cu kt | Zn kt | Pb kt | |||||
| Inferred Resource | | 11.8 | 1.32 | 1.79 | 0.99 | | 155 | 210 | 117 | ||
Notes: May 2021 Model (21E); totals may not sum due to rounding
Technical Report and Qualified Person Statement
The Technical Report was prepared in accordance with NI 43-101 and was filed today on SEDAR (www.sedar.com). Readers are encouraged to read the Technical Report in its entirety, including all qualifications, assumptions and exclusions that relate to the Mineral Resource estimates. The Technical Report is intended to be read as a whole, and sections should not be read or relied upon out of context.
The Technical Report was prepared by Ore Reserves Engineering ("ORE") under the supervision of Alan Noble, PE of ORE. Mr. Noble is a Qualified Person as defined under NI 43-101 and the AIM Rules and is independent of the Company. Mr. Noble has reviewed and approves the contents of this press release. He also consents to the inclusion of information related to Mineral Resources in this disclosure, in the form and context it appears.
Glossary of Terms
| CIM | Canadian Institute of Mining, Metallurgy and Petroleum |
| Cu | Copper |
| Indicated Mineral Resources | An Indicated Mineral Resource is that part of a Mineral Resource for which quantity, grade or quality, densities, shape and physical characteristics are estimated with sufficient confidence to allow the application of Modifying Factors in sufficient detail to support mine planning and evaluation of the economic viability of the deposit. Geological evidence is derived from adequately detailed and reliable exploration, sampling and testing and is sufficient to assume geological and grade or quality continuity between points of observation. An Indicated Mineral Resource has a lower level of confidence than that applying to a Measured Mineral Resource and may only be converted to a Probable Mineral Reserve. |
| Inferred Mineral Resource | An Inferred Mineral Resource is that part of a Mineral Resource for which quantity and grade or quality are estimated on the basis of limited geological evidence and sampling. Geological evidence is sufficient to imply but not verify geological and grade or quality continuity. An Inferred Mineral Resource has a lower level of confidence than that applying to an Indicated Mineral Resource and must not be converted to a Mineral Reserve. It is reasonably expected that the majority of Inferred Mineral Resources could be upgraded to Indicated Mineral Resources with continued exploration. |
| kt | Thousand tonnes |
| Measured Mineral Resources | A Measured Mineral Resource is that part of a Mineral Resource for which quantity, grade or quality, densities, shape, and physical characteristics are estimated with confidence sufficient to allow the application of Modifying Factors to support detailed mine planning and final evaluation of the economic viability of the deposit. Geological evidence is derived from detailed and reliable exploration, sampling and testing and is sufficient to confirm geological and grade or quality continuity between points of observation. A Measured Mineral Resource has a higher level of confidence than that applying to either an Indicated Mineral Resource or an Inferred Mineral Resource. It may be converted to a Proven Mineral Reserve or to a Probable Mineral Reserve. |
| M&I Mineral Resources | The aggregate of Measures Mineral Resources and Indicated Mineral Resources. |
| Mineral Resources | A concentration or occurrence of material of intrinsic economic interest in or on the Earth's crust in such a form and quantity that there are reasonable prospects for eventual economic extraction. The location, quantity, grade, geological characteristics and continuity of a Mineral Resource are known, estimated or interpreted from specific geological evidence and knowledge. Mineral Resources are sub-divided, in order of increasing geological confidence, into Inferred, Indicated and Measured categories. |
| Mt | Million tonnes |
| Mtpa | Million tonnes per annum |
| n.a. | Not available |
| NI 43-101 | Canadian National Instrument for the Standards of Disclosure for Mineral Projects |
| ORE | Ore Reserves Engineering |
| Pb | Lead |
| S | Sulphur |
| Zn | Zinc |
Contacts:
| SEC Newgate UK | Elisabeth Cowell / Axaule Shukanayeva / Max Richardson | + 44 20 3757 6882 |
| 4C Communications | Carina Corbett | +44 20 3170 7973 |
| Canaccord Genuity (NOMAD and Joint Broker) | Henry Fitzgerald-O'Connor / James Asensio | +44 20 7523 8000 |
| BMO Capital Markets (Joint Broker) | Tom Rider / Andrew Cameron | +44 20 7236 1010 |
| Peel Hunt LLP (Joint Broker) | Ross Allister / David McKeown | +44 20 7418 8900 |
About Atalaya Mining Plc
Atalaya is an AIM and TSX-listed mining and development group which produces copper concentrates and silver by-product at its wholly owned Proyecto Riotinto site in southwest Spain. Atalaya's current operations include the Cerro Colorado open pit mine and a modern 15 Mtpa processing plant, which has the potential to become a centralised processing hub for ore sourced from its wholly owned regional projects around Riotinto that include Proyecto Masa Valverde and Proyecto Riotinto East. In addition, the Group has a phased earn-in agreement for up to 80% ownership of Proyecto Touro, a brownfield copper project in the northwest of Spain, as well as a 99.9% interest in Proyecto Ossa Morena. For further information, visit www.atalayamining.com
Atalaya Mining plc
1 Lampousas Street
1095 Nicosia, Cyprus
Tel: +357 22442705
Fax: +357 22421956
www.atalayamining.com
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SOURCE: Atalaya Mining plc
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