Project Description

The Tintic Project, 100%-owned by Osisko Development, is located 95 km south of Salt Lake City, within the historic East Tintic Mining District of Central Utah, USA. The Company is currently focused on fast-tracking Trixie, which is one of several gold and base metal targets, including high-quality porphyry, epithermal and carbonate targets, within the larger Tintic Project consisting of 17,000 acres of patented mining claims and mineral leases, which host 23 past-producing mines within the Project boundaries.

An initial mineral resource estimate was published in Q1 2023 based on 4,467 underground chip samples, 4,780.1 m of current and verified historic drilling in 50 holes, of which 3,228.9 m of drilling in 23 holes were drilled by Osisko Development in 2022.

The T2 and T4 structures at Trixie show multi-ounce gold grades associated with high-sulphidation epithermal mineralization, structurally controlled and hosted within quartzites. Gold mineralization is associated with high-sulphidation epithermal mineralization, structurally controlled, and hosted within the quartzites. Mineralization consists of native Au, and rare Au-Ag rich telluride minerals with quartz and quartz-barite-sulphosalt stockwork veining.



Mineral Reserves and Resources

The Trixie mineral resource estimate (“MRE”) comprises five mineralized zones within the greater Trixie deposit, including T1, T2, T3, T4 and 75-85 zones over a strike length of 610 meters (“m”), a maximum width of 105 m and to a maximum depth of 295 m.

2023 Trixie MRE Separated by Domain – January 10, 2023

Domain Category Tonnes Grade
(Au g/t)
Gold (oz)
(Ag g/t)

Silver (oz)

T1 Measured
Indicated 34,470 16.39 18,159 30.55 33,856
M+I 34,470 16.39 18,159 30.55 33,856
Inferred 134,665 16.59 71,832 38.51 166,716
T2 Measured 10,938 190.61 67,029 195.53 68,757
Indicated 6,705 138.30 29,815 107.95 23,272
M+I 17,643 170.73 96,844 162.24 92,029
Inferred 25,181 101.37 82,070 146.32 118,457
T4 Measured
Indicated 178,825 16.64 95,667 43.65 250,941
M+I 178,825 16.64 95,667 43.65 250,941
Inferred 128,038 9.10 37,460 21.64 89,063
75-85 Measured
Indicated 4,870 14.10 2,207 51.77 8,106
M+I 4,870 14.10 2,207 51.77 8,106
Inferred 96,962 16.58 51,691 49.89 155,530
Total Measured 10,938 190.61 67,029 195.53 68,757
Indicated 224,870 20.17 145,849 43.73 316,175
M+I 235,808 28.08 212,878 50.77 384,932
Inferred 384,845 19.64 243,053 42.82 529,766


  1. Troy ounces (“oz“), gold (“Au“), silver (“Ag“), tonnes (“t“), grams per tonne (“g/t“).
  2. Effective date of the Trixie MRE is January 10, 2023.
  3. The Company intends to file a technical report (the “Technical Report“) in respect of the Trixie MRE in accordance with National Instrument 43-101 – Standards of Disclosure for Mineral Projects (“NI 43-101“) on SEDAR ( and on EDGAR ( under Osisko Development’s issuer profile within 45 days of the date of this news release.
  4. Each of Mr. William Lewis P.Geo, of Micon International Limited and Alan S J San Martin, AusIMM(CP), of Micon International Limited (i) has reviewed and validated the Trixie MRE, (ii) is considered to be independent of the Company for purposes of Section 1.5 of NI 43-101, and (iii) is a “qualified person” for purposes of NI 43-101.
  5. The Trixie MRE is comprised of five zones within the greater Trixie area: T1, T2, T3, T4 and 75-85. No blocks in the T3 meet the cut-off grade used for the Trixie MRE.
  6. The Trixie MRE disclosed in this news release were estimated using the CIM standards on mineral resources and reserves definitions, and guidelines prepared by the CIM standing committee on reserve definitions and adopted by the CIM council.
  7. Mineral Resources are reported when they are within potentially mineable shapes derived from a stope optimizer algorithm, assuming an underground longhole stoping mining method with stopes of 6.1 m x 6.1 m x minimum 1.5 m dimensions.
  8. Mineral resources are not mineral reserves and do not have demonstrated economic viability.
  9. Geologic modelling was completed by Osisko Development’s senior production geologist Courtney Kurtz, P.G. of Utah, USA using Leapfrog Geo software. The Trixie MRE was completed by Osisko Development’s Chief Resource Geologist, Daniel Downton, P.Geo. using Datamine Studio RM Pro 1.12 software. The Trixie MRE was reviewed and verified by William Lewis and Alan San Martin of Micon International Ltd.
  10. The estimate is reported for an underground mining scenario and with USD assumptions. The cut-off grade of 4.85 g/t Au was calculated using a gold price of US$1,750 per ounce, a CAD:USD exchange rate of 1.30; total mining, processing and G&A costs of US$226.62 per imperial ton a combined royalty of 4.5% and an average metallurgical recovery of 95%.
  11. Average bulk density values in the mineralized domains were assigned to the T1 (2.616 T/m3), T2 (2.955 T/m3), T3 (2.638 T/m3), T4 (2.621 T/m3), and 75-85 (2.617 T/m3) domains.
  12. Inverse Distance Squared interpolation method was used with a parent block size of 1.2 m x 1.2 m x 1.8 m.
  13. The results of the Trixie MRE are presented in-situ. Calculations used metric units (metres, tonnes, g/t). The number of tonnes is rounded to the nearest thousand. Any discrepancies in the totals are due to rounding effects.
  14. Neither the Company nor Micon International Limited is aware of any known environmental, permitting, legal, title-related, taxation, socio-political, marketing or other relevant issue that could materially affect the mineral resource estimate other than disclosed in this news release.


Ownership: 100% Osisko Development Corp.
Mineral Assets:
  • Trixie gold mine, underground production and exploration development
  • Eureka Standard, Ajax, North Lily (Trixie satellite expansion)
  • Burgin ( historic PEA (2011) Cu, Zn, Pb historic resource)
  • Cu-Mo-Au Porphyry Targets
  • Located in Central Utah, ~40 mi (64km) south of Provo
  • 60 mi (95 km) south of Salt Lake City
  • 45 mi (70 km) South of Bingham Mine and Smelter
Land Package:
  • 14,200 acres of patented mining claims
  • Additional 2,800 acres of leased claims
Current Mining:
  • Trixie high grade underground Au, Ag mine reopened by Tintic in 2021
  • 2021 production of 16,563 t @ 1.7 oz/t for a total of 14,608 oz with Vat leaching processing
  • Present capacity of ~35 tpd
  • Vat Leaching Circuit at Burgin mine site
  • Public utility power sub-station on-site
  • Sealed, paved road to access site, running through site
  • Int’l airport (Salt Lake) 80 mi (130 km) by road away
  • Mining and processing permits in place at Trixie

Maps & Sections

Property Location

Tintic Area Map

Claims Map

Adjacent Properties

East Tintic Geology

District Overview

District Deposits

Porphyry Potential

General Model of Deposit Styles

Tintic Section

Trixie Deposit Long Section

Trixie Deposit Structures

Stock Information





1100, av des Canadiens-de-Montreal
Suite 300, P.O. Box 211
Montreal, QC H3B 2S2

Tel: 1.514.940.0685

Int: 1.888.974.1402

Fax: 1.514.940.0687


BGM - Community Relations Office

4270 Sanders Ave., P.O. Box 250
Wells, BC V0K 2R0

Tel: 1.778.414.8493