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Orosur Mining Inc - Colombia update •Newmont to continue at Anzá gold project •US$500,000 option payment received

Mergers & Acquisitions Property Options & Staking

Orosur Mining Inc - Colombia update

•Newmont to continue at Anzá gold project

•US$500,000 option payment received

London, September 3 rd, 2020. Orosur Mining Inc. ("Orosur" or the "Company")

(TSX/AIM:OMI), announces that it has been informed by Newmont Colombia S.A.S.

("Newmont Colombia") a subsidiary of Newmont Corporation (NYSE:NEM), that it

intends to continue to exercise its rights and obligat ions with regard to the Anzá

gold project in Colombia (the "Anza Project") under the terms of the Exploration

Agreement with Venture Option (the "Agreement") signed and announced in

September 2018.

Newmont Colombia has now paid the fourth and final cash payment of US$500,000

required under the Phase I earn-in arrangement to retain its option and to continue

into the 3 rd year of Phase 1 of the Agreement during which year it is required to

spend a further US$4 million in qualifying expenditure on the Anza Project.

In addition, should qualifying expenditure incurred on the Anzá Project for the year

ending 7th September 2020, fall short of the required US$1m under the Agreement,

Newmont Colombia will be required to meet such shortfall by making a payment

equal to the shortfall to the Company no later than 6 th November 2020. The

amount of such payment would be determined once the total of qualifying

expenditure for the year ending 7th September 2020 has been accounted for.

In the 3 rd and 4 th years of Ph ase 1 of the Agreement, Newmont Colombia will be

required to spend a total of US$8 million in qualifying expenditure on the Anzá

Project to acquire a 51% ownership interest. No further cash payments are due to

the Company in the remaining two years of Phase 1 of the Agreement.

To view the full PDF version of this announcement, including Figures 1-3 referred to

below, please click here: http://www.rns-

pdf.londonstockexchange.com/rns/8663X_1-2020-9-2.pdf

About the Anzá Project

Anzá is a gold exploration project, comprising three exploration licences, four

exploration licence applications, and several small exploitation permits, totalling

207.5km2 in the prolific Mid-Cauca belt of Colombia.

The Anzá Project is currently wholly owned by Orosur via its subsidiary, Minera

Anzá S.A.

The project is located 50km west of Medellin and is easily accessible by all-weather

roads and boasts excellent infrastructure including water, power, communications

and large exploration camp.

Anzá lies some 60km south along strike from the giant Buriticá deposit, recently

acquired by Zijin Mining for CAN$1.4 billion.

Figure 1. Anzá Location Map

The Anzá Project was acquired by Orosur in 2014, via the acquisition by Orosur of

Canadian company Waymar Resources (Waymar) (TSXV:WYM).

Orosur and Waymar explored the project using a variety of techniques including

over 24,000m of drilling. Most drilling focussed on the APTA prospect, with a small

drilling program identifying mineralisation 1.5km west at the Charrascala prospect.

Geochemistry and other work identified several other targets (Jesuitas, Guaimarala

and La Cejita) which have not been drill tested (Figure 2)

Drilling at APTA has defined multiple zones of high -grade gold mineralisation

covering a strike of approximately 1.5km, to a depth extent of over 275m, with

mineralisation remaining open in all directions. (Figure 3) (Appendix I)

In September 2018, the Anzá project was optioned to Newmont Colombia.

Figure 2. Surface Geochemistry and Target Zones

Figure 3. APTA Drill Plan and Section

Exploration Agreement with Venture Option

The Agreement is described on SEDAR and in previous announcements made by

the Company. The key points, which were announced on 10 September 2018, are

as follows:

The Agreement provides for a three -phase earn-in structure allowing Newmont

Colombia to earn up to a 75% ownership interest in the Anzá Project by spending a

minimum of US$30.0 million in qualifying expenditures over twelve years to 2030,

completing an NI 43 -101 compliant feasibility study and making total cash

payments to Orosur of US$4.0 million over Phases 1 and 2.

In Phase 1, Newmont may earn a 51% ownership interest by spending US$10.0

million in qualifying project expenditures over four years to September 2022 and

making total cash payments to Orosur of US$2.0 million during the first two yea rs

of the Phase 1 earn -in period. Upon Newmont Colombia's completion of Phase 1,

it may elect, in its sole discretion, to exercise its option to form a joint venture with

Minera Anzá S.A.

In Phase 2 commencing October 2022, Newmont may elect to earn an add itional

14% ownership interest in the Anz á Project by sole -funding US$20.0 million in

qualifying expenditures within four years, completing an NI 43-101 compliant pre-

feasibility study and making total cash payments to Orosur of US$2.0 million.

In Phase 3 commencing 2026, Newmont may elect to earn an additional 10%

ownership interest in the Anz á Project by completing an NI 43 -101 compliant

feasibility study within four years.

Upon Newmont completing the Phase 3 earn-in, Orosur may elect for Newmont to

solely fund all expenditures until the commencement of commercial production at

the Anzá Project. If the Company elects for Newmont to do so:

• Newmont's ownership interest shall increase by 5% to 80% in the Anz á

Project;

• Upon the commencement of commercial production, Orosur shall

commence contributing funds for adopted programs and budgets in

proportion to its ownership interest or suffer dilution of its ownership

interest; and

• Newmont shall receive 90% of Orosur's distribution of earnings or dividends

until such time as the amounts received equal the aggregate amount of

expenditures incurred by Newmont on behalf of Orosur plus nominal

interest.

Brad George, CEO of Orosur, commented:

"We have long valued Newmont as both partner and major shareholder, and we

are delighted with their decision to continue to work with us on the Anzá Project"

Appendix I

Table 1 Previously announced notable drill results from the APTA Prospect

Hole

Number From (m) To (m)

Interval

(m) Au (g/t) Ag (g/t) Zn (%)

MAP_011 213.00 219.00 6.00 18.26 1.96 0.35

including 217.50 219.00 1.50 72.30 6.90 0.93

MAP_020 145.00 186.00 41.00 3.85 1.39 1.25

including 171.30 177.00 5.70 19.84 3.94 1.66

MAP_021 224.00 242.00 18.00 14.14 2.05 2.83

including 225.00 229.40 4.40 45.62 5.47 10.59

252.00 253.00 1.00 10.85 1.80 0.67

MAP_029 183.00 194.90 11.90 10.57 2.40 1.61

including 185.00 187.00 2.00 40.25 4.85 4.64

MAP_033 157.10 179.50 22.40 10.42 1.87 1.56

including 165.00 170.80 5.80 29.49 3.37 2.81

MAP_036 198.60 227.50 28.90 3.88 1.68 0.43

including 205.50 217.50 12.00 8.83 2.65 0.59

MAP_038 123.40 124.50 1.10 15.40 3.60 1.94

172.00 212.50 40.50 14.09 3.82 1.95

including 179.50 186.00 6.50 70.99 6.34 0.12

including 184.60 186.00 1.40 176.00 15.20 0.39

including 202.00 205.40 3.40 20.89 9.71 4.75

MAP_043 65.50 68.60 3.10 7.66 73.04 0.68

167.50 231.50 64.00 1.88 1.88 0.70

including 209.00 214.00 5.00 9.07 3.40 0.70

MAP_047 105.00 118.30 13.30 2.24 316.25 1.00

including 106.00 110.50 4.50 4.69 768.89 2.34

MAP_048 181.00 195.70 14.70 40.37 9.00 3.41

including 185.50 195.70 10.20 58.03 13.16 4.85

including 187.60 189.50 1.90 219.00 29.50 6.55

MAP-054 41.40 59.30 17.90 2.96 26.97 0.32

including 41.40 43.20 1.80 10.25 76.90 1.22

including 44.70 52.00 7.30 3.39 33.77 0.37

97.10 110.90 13.80 4.36 1.19 0.77

including 97.10 101.73 4.63 5.47 1.59 1.44

including 107.60 110.90 3.30 10.35 0.83 0.14

144.50 149.82 5.32 17.76 1.55 4.74

including 144.50 145.70 1.20 8.71 0.90 0.80

including 145.70 146.70 1.00 37.96 1.30 0.70

including 146.70 148.00 1.30 19.76 1.40 0.25

including 148.00 148.87 0.87 17.63 1.50 7.56

including 148.87 149.82 0.95 5.31 2.90 17.54

149.82 159.10 9.28 1.84 0.94 2.26

including 153.00 155.00 2.00 3.43 0.97 1.14

309.20 313.20 4.00 2.96 5.70 0.41

MAP_055 177.00 190.90 13.90 4.89 4.86 1.35

including 177.00 181.00 4.00 6.26 3.35 0.57

including 185.00 190.90 5.90 7.24 8.73 2.78

MAP_056 223.00 235.00 12.00 1.33 0.90 0.05

including 231.00 233.00 2.00 2.62 1.00 0.02

MAP_058 246.00 250.00 4.00 1.10 3.45 0.15

including 274.50 276.50 2.00 4.55 6.50 0.13

MAP_059 163.50 195.00 31.50 1.86 2.39 0.49

including 181.00 188.00 7.00 4.66 2.17 0.27

including 192.00 194.00 2.00 3.40 3.55 0.56

230.50 242.50 12.00 1.96 2.73 0.50

including 230.50 236.50 6.00 3.15 1.75 0.63

MAP-060 70.00 75.50 5.50 3.34 3.55 0.56

165.00 192.00 27.00 1.81 0.87 0.33

including 180.00 186.00 6.00 2.92 0.67 0.20

including 189.00 192.00 3.00 4.60 2.90 1.52

222.00 247.00 25.00 4.86 3.23 1.73

including 222.00 226.00 4.00 7.92 4.13 1.94

including 235.00 238.00 3.00 9.54 5.37 0.33

including 245.00 246.00 1.00 14.43 3.40 0.95

MAP_062 60.00 65.30 5.30 5.09 12.06 0.37

including 62.20 64.20 2.00 7.61 16.90 0.80

167.50 176.50 9.00 1.69 0.62

217.00 240.00 23.00 5.00 3.37 0.40

including 220.00 221.00 1.00 16.02 9.40 0.81

including 229.70 232.20 2.50 8.59 2.98 0.66

including 237.70 240.00 2.30 14.94 7.88 0.13

MAP_064 116.00 122.00 6.00 1.57 19.98 1.73

147.00 151.00 4.00 0.84 0.60 0.04

190.00 197.00 7.00 3.45 1.00 3.79

including 193.00 197.00 4.00 5.43 1.50 6.41

265.00 273.70 8.70 1.67 3.13 5.35

283.70 285.30 1.60 3.18 1.94 3.03

292.00 294.00 2.00 2.04 1.75 5.90

297.00 299.00 2.00 1.03 1.05 2.18

MAP_065 140.00 144.10 4.10 2.22 1.37 0.04

283.30 288.45 5.15 1.24 5.75 0.11

including 284.30 286.10 1.80 2.70 10.30 0.09

312.00 313.50 1.50 1.05 0.60 0.54

MAP_067 161.70 168.10 6.40 1.74 2.52 0.34

including 162.80 165.00 2.20 4.14 30.50 0.79

176.40 192.20 15.80 1.07 2.04 0.06

including 179.00 184.00 5.00 2.24 3.28 0.13

235.00 243.20 8.20 1.36 0.78 0.38

including 237.00 241.20 4.20 2.09 0.87 0.49

MAP_070 168.00 192.00 24.00 1.84 1.64 1.09

including 168.00 173.00 5.00 1.66 3.52 4.81

including 183.00 184.00 1.00 23.66 3.60 0.04

including 186.00 192.00 6.00 1.16 0.72 0.02

208.00 212.00 4.00 1.13 1.72 0.61

221.00 233.00 12.00 5.28 2.48 1.10

including 222.00 226.00 4.00 6.38 3.10 2.28

including 228.00 233.00 5.00 6.99 2.78 0.65

246.00 248.00 2.00 6.28 6.30 1.41

including 256.00 267.00 11.00 6.35 2.74 1.55

284.00 298.00 14.00 5.02 2.23 1.10

including 286.00 292.00 6.00 9.62 2.90 1.75

302.00 307.00 5.00 1.57 3.94 1.67

Notes:

1. Significant intervals are chosen based on continuity of mineralization and gold grade.

2. All intervals are reported as drilled thicknesses; true thicknesses are estimated to be 65 -85% of drilled

thicknesses.

3. Gold grades have been calculated based on weighted averages

For further information, please contact:

Orosur Mining Inc

Louis Castro, Chairman,

Brad George, CEO

[email protected]

Tel: +1 (778) 373-0100

SP Angel Corporate Finance LLP - Nomad & Joint Broker

Jeff Keating / Caroline Rowe

Tel: +44 (0) 20 3 470 0470

The information contained within this announcement is deemed by the Company to constitute inside information

as stipulated under the Market Abuse Regulation ("MAR"). Upon the publication of this announcement via

Regulatory Information Service, this inside information is now considered to be in the public domain.

About Orosur Mining Inc.

Orosur Mining Inc. (TSX: OMI; AIM: OMI) is a precious metals developer and explorer focused on identifying and

advancing gold projects in South America. The Company operates in Colombia and Uruguay.

Forward Looking Statements

All statements, other than statements of historical fact, contained in this news release constitute "forward looking

statements" within the meaning of applicable securities laws, including but no t limited to the "safe harbour"

provisions of the United States Private Securities Litigation Reform Act of 1995 and are based on expectations

estimates and projections as of the date of this news release.

Forward-looking statements include, without limitation, the exploration plans in Colombia and the funding from

Newmont of those plans, Newmont´s decision to continue with the Exploration and Option agreement, the ability

for Loryser to continue and finaliz e with the remediation in Uruguay, the ability to implement the Creditors'

Agreement successfully as well as continuation of the business of the Company as a going concern and other

events or conditions that may occur in the future. The Company's continuan ce as a going concern is dependent

upon its ability to obtain adequate financing, to reach profitable levels of operations and to reach a satisfactory

implementation of the Creditor´s Agreement in Uruguay. These material uncertainties may cast significant doubt

upon the Company's ability to realize its assets and discharge its liabilities in the normal course of business and

accordingly the appropriateness of the use of accounting principles applicable to a going concern. There can be

no assurance that such statements will prove to be accurate. Actual results and future events could differ materially

from those anticipated in such forward looking statements. Such statements are subject to significant risks and

uncertainties including, but not limited, those as described in Section "Risks Factors" of the MDA and the Annual

Information Form. The Company disclaims any intention or obligation to update or revise any forward -looking

statements whether as a result of new information, future events and such forward -looking statements, except to

the extent required by applicable law.