Taseko Mines | Reserves & Resources

Gibraltar
Florence Copper
Yellowhead
Aley
New Prosperity

Category	US Short Tons (millions)	Copper Grade (%)	Molybdenum Grade (%)
Sulphide Mineral Reserves as of December 31, 2023 at a 0.15% copper cut-off
Proven	459	0.26	0.008
Probable	175	0.22	0.008
Ore Stockpiles	11	0.18	0.005
Total Proven and Probable Sulphide Reserves	645	0.25	0.008
Oxide Mineral Reserves as of December 31, 2023 at a 0.10% acid soluable copper cut-off
Proven	1	0.14	--
Probable	10	0.14	--
Ore Stockpiles	7	0.16	--
Total Proven and Probable Oxide Reserves	18	0.15	--
Mineral Resources as of December 31, 2023 at a 0.15% copper cut-off
Measured	790	0.25	0.008
Indicated	353	0.23	0.007
Total Measured and Indicated Resources	1,143	0.25	0.007
Inferred	75	0.22	0.004

The resource and reserve estimation was completed under the supervision of Richard Weymark, P. Eng., MBA, Vice President, Engineering for Taseko and a Qualified Person as defined by NI 43-101.
Gibraltar Mineral Reserves and Mineral Resources as of December 31, 2021 have been depeted to reflect mining in 2022 and 2023 as documented in the Company’s Annual Information Form for the Year Ended December 31, 2023 which is available on SEDAR+ at www.sedarplus.ca.
Gibraltar Mineral Reserves and Mineral Resources follow CIM Definition Standards for Mineral Resources and Mineral Reserves (2014).
Sulphide Mineral Reserves are exclusive of Oxide Mineral Reserves. Both Sulphide Mineral Reserves and Oxide Mineral Reserves are contained within Mineral Resources.
Oxide Mineral Reserve grades are reported in-terms of acid soluable copper.
Mineral Resources that are not Mineral Reserves do not have demonstrated economic viability.
Mineral Reserves are assumed to be extracted using open pit mining methods and are based on US$3.05/lb Cu price, $12.00/lb Mo price, exchange rate of US$0.80=C$1.00, metallurgical recoveries of 85% TCu and 40% Mo for sulphide ore and 50% ASCu for oxide ore.
The Mineral Resource has been confined by a “reasonable prospects of eventual economic extraction” pit using the following assumptions: Cu price of US$3.50/lb, Mo price of US$14.00/lb, exchange rate of US$0.80=C$1.00, metallurgical recoveries of 85% for TCu and 40% for Mo.
A tonnage factor of 12ft3/ton has been applied for rock and 15ft3/ton for overburden and fill.
Additional information regarding data verification, exploration information, known legal, political, environmental or other risks can be found in the report entitled “Technical Report on the Mineral Reserve Update at the Gibraltar Mine, British Columbia, Canada” issued March 30, 2022 with an effective date of Match 15, 2022 which is available on SEDAR+ at www.sedarplus.ca. The Gibraltar Technical Report was prepared under the supervision of Richard Weymark, P. Eng., MBA. Vice President, Engineering of Taseko and a Qualified Person as defined by NI 43-101.
Numbers may not add due to rounding.

Category	US Short Tons (millions)	Copper Grade (%)
Mineral Reserves Effective December 31, 2022
Proven	258	0.35
Probable	63	0.40
Total Proven and Probable Reserves	320	0.36
Mineral Resources Effective December 31, 2022
Measured	292	0.34
Indicated	71	0.39
Total Measured and Indicated Resources	363	0.35
Inferred	42	0.32

The resource and reserve estimation was completed under the supervision of Richard Weymark, P. Eng., MBA, Vice President, Engineering for Taseko and a Qualified Person as defined by NI 43-101.
Florence Mineral Reserves and Mineral Resources follow CIM Definition Standards for Mineral Resources and Mineral Reserves (2014).
Mineral Reserves are contained within Mineral Resources.
Mineral Resources that are not Mineral Reserves do not have demonstrated economic viability.
Mineral Reserves are assumed to be extracted using ISCR extraction methods using the following assumptions: $3.05 Cu price, $31,600/acre for core hole abandonment, $240,400/acre for cultural mitigations in identified Cultural Sites, $149,600 + $263/foot well drilling costs, $160/ton acid cost, $45.30/ton acid applied for well field operating costs, 1.2% surface losses, $0.10/lb Cu for electrowinning cost, $0.12/lb Cu G&A cost, $0.69/ton reclamation cost, $0.02/lb Cu shipping cost, 7% NSR royalties on ALSD land, 3% NSR royalties on freehold land, and 2.5% royalties on net profit.
Mineral Resources are confined to the Oxide and Transition zones inside a “reasonable prospects of eventual economic extraction” boundary assuming ISCR extraction methods using the following assumptions: $3.50 Cu price, $31,600/acre for core hole abandonment, $240,400/acre for cultural mitigations in identified Cultural Sites, $149,600 + $263/foot well drilling costs, $160/ton acid cost, $45.30/ton acid applied for well field operating costs, 1.2% surface losses, $0.10/lb Cu for electrowinning cost, $0.12/lb Cu G&A cost, $0.69/ton reclamation cost, $0.02/lb Cu shipping cost, 7% NSR royalties on ALSD land, 3% NSR royalties on freehold land, and 2.5% royalties on net profit.
Mineral Reserves and Mineral Resources are reported without a cut-off grade to reflect the nature of the ISCR extraction method proposed.
Tonnage factors of 13.5 ft3/ton and 13.13 ft3/ton have been applied corresponding to 8% porosity in the upper oxide zone and 5% porosity in the lower oxide and transition zones.
Additional information regarding data verification, exploration information, known legal, political, environmental or other risks can be found in the report entitled “NI 43-101 Technical Report – Florence Copper Project, Pinal County, Arizona” issued March 30, 2023 with an effective date of March 15, 2023 which is available on SEDAR. The Florence Copper Project Technical Report was prepared under the supervision of Richard Tremblay, P.Eng., MBA, Richard Weymark, P.Eng., MBA, and Robert Rotzinger, P.Eng. Mr. Tremblay is employed by the Company as Sr. Vice President Operations, Mr. Weymark is Vice President Engineering and Robert Rotzinger is Vice President Capital Projects. All three are Qualified Persons as defined by NI 43–101.
Numbers may not add due to rounding.

Category	Metric Tonnes (millions)	Copper Grade (%)	Gold Grade (g/t)	Silver Grade (g/t)
Mineral Reserves Effective December 31, 2019 at a 0.17% copper cut-off
Proven	458	0.29	0.031	1.3
Probable	359	0.26	0.028	1.2
Total Proven and Probable Reserves	817	0.28	0.030	1.3
Mineral Resources Effective December 31, 2019 at a 0.15% copper cut-off
Measured	561	0.27	0.029	1.2
Indicated	730	0.24	0.027	1.2
Total Measured and Indicated Resources	1,292	0.25	0.028	1.2
Inferred	109	0.24	0.026	1.2

The resource and reserve estimation was completed under the supervision of Richard Weymark, P. Eng., MBA, Vice President, Engineering for Taseko and a Qualified Person as defined by NI 43-101.
Yellowhead Mineral Reserves and Mineral Resources follow CIM Definition Standards for Mineral Resources and Mineral Reserves (2014).
Mineral Reserves are contained within Mineral Resources.
Mineral Resources that are not Mineral Reserves do not have demonstrated economic viability.
Mineral Reserves are assumed to be extracted using open pit mining methods and are based on US$2.40/lb Cu price, US$1000/oz Au price, US$13.50/oz Ag price, exchange rate of US$0.80=C$1.00, metallurgical recoveries of 90% Cu, 56% Au and 59% Ag.
The Mineral Resource has been confined by a “reasonable prospects of eventual economic extraction” pit using the following assumptions: US$3.25/lb Cu price, US$1300/oz Au price, US$17.00/oz Ag price, exchange rate of US$0.80=C$1.00, metallurgical recoveries of 89% Cu, 55% Au and 59% Ag at a 0.15% Cu cut-off grade, processing and G&A costs of C$5.25/t, pit rim mining costs of C$1.86/t with a bench increment of C$0.029/t and pit slopes between 30-40 degrees.
Densities were modeled based on modeled lithologies and range from 2.71 t/m3 to 2.85 t/m3 except for overburden which uses a density of 2.20 t/m3.
Additional information regarding data verification, exploration information, known legal, political, environmental or other risks can be found in the report entitled “Technical Report on the Mineral Reserve Update at the Yellowhead Copper Project, British Columbia, Canada” issued January 16, 2020 with an effective date of January 16, 2020 which is available on SEDAR. The Yellowhead Project Technical Report was completed under the supervision of Richard Weymark, P. Eng., MBA, Vice President, Engineering for Taseko and a Qualified Person as defined by NI 43-101.
Numbers may not add due to rounding.

Category	Metric Tonnes (millions)	Nb₂O₅ Grade (%)
Mineral Reserves Effective September 15, 2014 at a 0.30% Nb₂O₅ cut-off
Proven	44	0.52
Probable	40	0.48
Total Proven and Probable Reserves	84	0.50
Mineral Resources Effective September 15, 2014 at a 0.20% Nb₂O₅ cut-off
Measured	113	0.41
Indicated	173	0.35
Total Measured and Indicated Resources	286	0.37
Inferred	144	0.32

The resource and reserve estimation was completed under the supervision of Scott Jones, P. Eng., former Vice President, Engineering for Taseko and a Qualified Person as defined by NI 43-101.
Aley Mineral Reserves and Mineral Resources follow CIM Definition Standards for Mineral Resources and Mineral Reserves (2014).
Mineral Reserves are contained within Mineral Resources.
Mineral Resources that are not Mineral Reserves do not have demonstrated economic viability.
Mineral Reserves are assumed to be extracted using open pit mining methods and are based on US$45.00/kg Nb price, exchange rate of US$0.90=C$1.00, metallurgical recoveries of 65.4%, total operating costs of $55.79 per tonne milled.
The Mineral Resource has been confined by a “reasonable prospects of eventual economic extraction” pit using the following assumptions: US$50.00/kg Nb price, exchange rate of US$0.80=C$1.00, metallurgical recovery of 67% Nb, operating cost of $57.00 per tonne milled and pit slopes of 45 degrees.
Densities were modeled based on modeled lithologies and range from 2.88 t/m3 to 2.90 t/m3 except for overburden which uses a density of 2.0 t/m3.
Additional information regarding data verification, exploration information, known legal, political, environmental or other risks can be found in the report entitled “Technical Report on Mineral Reserves at the Aley Project, British Columbia, Canada” issued October 30, 2014 with an effective date of September15, 2014, as amended and restated December 4, 2017 which is available on SEDAR. The Aley Project Technical Report was prepared under the supervision of Scott Jones, P.Eng., Keith Merriam, P.Eng., Greg Yelland, P.Eng., Robert Rotzinger, P.Eng., and Ronald G. Simpson, P.Geo. Mr. Jones, Mr. Merriam and Mr. Yelland were formerly employed by the company as Vice President, Engineering; Manager, Process Engineering; and Chief Engineer respectively. Mr. Rotzinger is employed by the company as Vice President, Capital Projects and Mr. Simpson is independently employed by GeoSim Services Inc. All five were Qualified Persons as defined by NI 43–101.
Numbers may not add due to rounding.

Category	Metric Tonnes (millions)	Copper Grade (%)	Gold Grade (g/t)
Mineral Reserves Effective November 2, 2009 at a C$5.50 NSR/t Pit-Rim cut-off
Proven	481	0.26	0.46
Probable	350	0.18	0.35
Total Proven and Probable Reserves	831	0.23	0.41
Mineral Resources Effective November 2, 2009 at 0.14% copper cut-off
Measured	547	0.27	0.46
Indicated	463	0.21	0.34
Total Measured and Indicated Resources	1,010	0.24	0.41

The resource and reserve estimation was completed under the supervision of Scott Jones, P. Eng., former Vice President, Engineering for Taseko and Qualified Person as defined by NI 43-101.
Mineral Reserves are contained within Mineral Resources.
Mineral Resources that are not Mineral Reserves do not have demonstrated economic viability.
Mineral Reserves are assumed to be extracted using open pit mining methods and are based on US$1.25/lb Cu price, US$500/oz Au price, exchange rate of US$0.74=C$1.00, mining cost of C$1.20/t plus a bench increment of $0.03/t mined, Milling and G&A cost of $4.20/t milled and metallurgical recoveries of 90% Cu and 70% Au.
Additional information regarding data verification, exploration information, known legal, political, environmental or other risks can be found in the report entitled “Technical Report on the 344 Million Tonne Increase in Mineral Reserves at the Prosperity Gold-Copper Project, British Columbia, Canada” issued December 17, 2009 with an effective date of November 2, 2009. The New Prosperity Technical Report was prepared under the supervision of Scott Jones, P.Eng., former Vice President, Engineering for Taseko and a Qualified Person as defined by NI 43-101.
Numbers may not add due to rounding.
Readers are cautioned that the Prosperity Technical Report has not been updated since 2009 and accordingly, caution needs to be advised when assessing its conclusions in light of current operating and capital costs, appropriate technologies, metals price outlooks, and like matters.