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Third Quarter Results for 2022/23

Financials

CORPORATE

Orosur Mining Inc

Third Quarter Results for 2022/23

London, April 27th, 2023. Orosur Mining Inc. ("Orosur" or "the Company") (TSXV/AIM: OMI), a

South American-focused minerals explorer and developer, is pleased to announce the results for

the third quarter ended February 28th, 2023 ("Q3 23" or the "Quarter"). All dollar figures are stated

in US$ unless otherwise noted. The unaudited condensed interim financial statements of the

Company for the Quarter and the related management's discussion and analysis have been filed

and are available for review on the SEDAR website at www.sedar.com. They are also available

on the Company's website at www.orosur.ca.

Highlights of the Third Quarter Results for 2022/23

Colombia

 On December 2, 2022, the Company announced assay results from another four holes

at Pepas, holes PEP002,006,008 and 009. Holes PEP002 and 006 did not yield significant

results. Two new drill pads were constructed to drill holes PEP008 and PEP009. Both

holes intersected mineralised structures, largely as expected, but with lower levels of gold

mineralisation than intersected in previous drilling. Near term focus will now shift away

from drilling to field mapping, sampling and trenching activities will continue across the

Project to define further drilling targets, including additional surface works specifically in

the Pepas prospect area.

 On January 17, 2023, the Company announced that negotiations to complete the new

Mining Company Constituent Documents with Minera Monte Aguila ("MMA") were

progressing and that the US$2 million Phase 2 payment would be paid soon. The

formation of the new Mining Company, which will take several months, is underway. Once

formed, the Mining Company will be owned 49% by Orosur and 51% by MMA who will

also be the manager. MMA may earn an additional 14% ownership in the Mining

Company if it has spent US$20 million in qualifying exploration expenditures on the Anzá

Project ("Project") on or prior to the fourth anniversary of the parties entering into

the Mining Company Constituent Documents. If the Phase 2 earn-in is completed, MMA

would own 65% of the Mining Company and the Company would own the remaining 35%.

 On March 2, 2023, post the Quarter end, the Company announced that it had received

the Phase 2 option payment of US$2 million that was due as part of the process of MMA

moving from Phase 1 to Phase 2 of the Project. Following completion of drilling,

exploration work at Anzá has been wound back to allow for the required corporate

restructuring of the joint venture to be completed, and to advance a variety of licence

processes such as integration of smaller licences and conversion of applications to

granted status.

CORPORATE

Argentina

 On March 2, 2023, the Company announced that results to date continue to be extremely

encouraging, with the latest round of mapping and sampling suggestive that El Pantano

has potential to host a major, previously unexplored low-sulphidation epithermal system.

In the low-sulphidation model, fluid boiling is the key gold depositional mechanism, such

that gold mineralisation is constrained to a distinct vertical zone, and there may be limited

or no gold anomalism at surface. Instead, pathfinder elements are a more important guide

to mineralisation, especially mercury (Hg) and arsenic (As). Recent work is expanding the

picture of very large zones of Hg and As anomalism along more than 8km strike of a major

NW trending structure.

 Geological mapping, geochemical sampling and ground magnetic surveys are

continuing. It is also planned that other geophysical methods such as Induced

Polarization (IP) may be employed. Environmental permitting work is also underway that

will allow drilling to be undertaken later in the year or early next year.

Brazil

 On March 2, 2023, the Company announced that its large-scale regional sampling

program which had been underway for the last several months, taking stream and

drainage sediment samples over much of the Ariquemes district, was now complete. Final

results are pending. Once received, it is anticipated that this regional dataset will be able

to provide vectors to potential mineralisation that will then form the basis for more targeted

exploration programs in the near term.

Uruguay

 In the previous accounting year, Loryser agreed and paid for the settlements with all of its

former employees, with the proceeds received from the sale of certain of its assets. In the

current year to date it has finalised the reclamation and remediation works on the tailings

dam and has started a one-year post-closure control phase which is progressing well.

 During this Quarter, Loryser also succeeded in selling all of its remaining assets included

in the Creditors Agreement as set out in that agreement and it will now, post Quarter end,

be distributing the proceeds, on a pro rata basis, to Loryser's trade creditors in accordance

with the Creditors' Agreement, via a court approved paying agent.

Financial and Corporate

 The unaudited consolidated financial statements have been prepared on a going concern

basis under the historical cost method except for certain financial assets and liabilities

which are accounted for as Assets and Liabilities held for sale (at the lower of book value

or fair value) and Profit and Loss from discontinuing operations. This accounting treatment

has been applied to the activities in Uruguay and Chile.

CORPORATE

 On December 7, 2022, all of the outstanding 10,897,058 warrants expired and so the fully

diluted share capital of the Company as at the date of this MD&A is 199,750,299.

 On February 28, 2023, the Company had a cash balance of $4,151k (May 31, 2022

$4,221k). As at the date of this announcement the Company had a cash balance of

$3,857k.

Condensed Interim Consolidated Statements of Financial

Position (Expressed in thousands of United States

dollars)

Unaudited

As at

As at

February 28,

2023

May 31,

2022

ASSETS

Current assets

Cash and cash equivalents

$ 4,151

$ 4,221

Restricted cash 10 353

Accounts receivable and other assets 155 186

Assets held for sale in Uruguay 2,407 1,160

Total current assets 6,723 5,920

Non-current assets

Property, plant and equipment

90

113

Exploration and evaluation assets Colombia 2,630 5,441

Total assets $ 9,443 $ 11,474

LIABILITIES AND (DEFICIT)

Current liabilities

Accounts payable and accrued liabilities

$ 316

$ 389

Liabilities of Chile discontinued operation 2,135 2,058

Warrant liability - 168

Liabilities held for sale in Uruguay 12,426 13,134

Total current liabilities 14,877 15,749

Deficit

Share capital

69,341

69,339

Contributed surplus 10,539 10,540

Currency translation reserve (3,060) (2,125)

Deficit (82,255) (82,029)

Total deficit (5,434) (4,275)

Total liabilities and deficit $ 9,443 $ 11,474

CORPORATE

Condensed Interim Consolidated Statements of Loss and Comprehensive

Loss (Expressed in thousands of United States dollars)

Unaudited

Three

Mon

ths

End

ed

February

28,

Three

Months

Ended

February 28,

Six Months

Ended

February

28,

Six

Months

Ended

February

28,

2023 202

2

2023 2022

Operating expenses

Corporate and administrative

expenses $ (473)

$ (444)

$ (1,316

)

$ (1326

)

Exploration

expenses (296)

(26) (543) (36)

Share-based

compensation -

(41) - (274)

Other

income 7

- 15 2

Net finance

cost (2)

(3) (7) (6)

Gain on fair value of

warrants -

428 168 1,301

Foreign exchange (loss) gain

net (54)

(33) (106) (135

)

Net (loss) for the period for continued operations

$ (818)

Other comprehensive (loss) income:

Cumulative translation

adjustment $ 1

$ (37)

$ (139)

$ (1,789

)

$ (934

)

$ (477)

$ (333

)

Total comprehensive (loss) for the

period from continued operations

(817)

(176)

(2,723)

(810)

Income (loss) from discontinued operations

513

(373)

1,56

3

(315)

Total comprehensive (loss) for the period (304) (549) (1,160) (1,215)

Basic and diluted net (loss) per share for

continued operations

$ (0.00)

$ (0.00)

$ (0.01

)

$ (0.00

)

Basic and diluted net (loss) income per

share for discontinued operations

$

0.00

$

(0,00)

$

0.01

$

(0.00)

Weighted average number of common

shares outstanding

188,560

188,420

188,544

188,420

CORPORATE

Consolidated Statements of Cash Flows

(Expressed in thousands of United States

dollars)

Nine Months

Ended

Nine Months

Ended

February 28,

2022

February 28,

2021

Operating activities

Net loss for the year for continued and discontinued operations $ (226) $ (792)

Adjustments for:

Share-based payments - 274

Labour provision adjustments - (1,600)

Obsolescence provision (3,103) (1,100)

Fair value of warrants (168) (1,301)

Accretion of asset retirement obligation (817) -

Gain on sale of property, plant and equipment (1,396) (230)

Foreign exchange and other 68 56

Changes in non-cash working capital items:

Accounts receivable and other assets (106) 51

Inventories 3,415 1,504

Accounts payable and accrued liabilities 93 920

Net cash used in operating activities (2,240) (2,218)

Investing activities

Increase (decrease) in the restricted cash 343 (719)

Proceeds received for sale of property, plant and equipment 945 746

Purchase of property, plant and equipment (1) -

Environmental rehabilitation provision - (1,100)

Proceeds received from exploration and option agreement 2,085 1,266

Exploration and evaluation expenditures (191) (1,630)

Net cash provided by investing activities 3,181 (1,437)

Financing activities

Proceeds from the sale of treasury shares - 719

Proceeds from sale of options 2 -

Net cash provided by financing activities 2 719

Net Change in cash and cash equivalents 943 (2,936)

Net change in cash classified within assets held for sale (1,013) 769

Cash and cash equivalents, beginning of year 4,221 6,958

Cash and cash equivalents, end of year $ 4,151 $ 4,791

Operating activities

- continued operations (2,308) (1,803)

- discontinued operations 68 (415)

Investing activities

- continued operations 2,236 (1,083)

- discontinued operations 945 (354)

Financing activities

- continued operations 2 719

CORPORATE

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 / Kasia Brzozowska

Tel: +44 (0) 20 3 470 0470

Turner Pope Investments (TPI) Ltd - Joint Broker

Andy Thacker

JamesPope

Tel: +44 (0)20 3657 0050

Flagstaff Strategic and Investor Communications

Tim Thompson

Mark Edwards

Fergus Mellon

Tel: +44 (0) 207 129 1474

[email protected]

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

constitute inside information as stipulated under the Market Abuse Regulations (EU)

No. 596/2014 ('MAR') which has been incorporated into UK law by the European Union

(Withdrawal) Act 2018. Upon the publication of this announcement via Regulatory Information

Service ('RIS'), this inside information is now considered to be in the public domain.

Neither TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in

policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this

release.

About Orosur Mining Inc.

Orosur Mining Inc. (TSX-V: OMI; AIM: OMI) is a minerals explorer and developer focused on

identifying and advancing projects in South America. The Company currently operates in

Colombia, Brazil, Argentina and has discontinued operations in Uruguay.

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.

CORPORATE

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.

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 not

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 Brazil and the funding from Newmont/Agnico of those plans, Newmont/Agnico´s decision to

continue with the Exploration and Option agreement, the ability for Loryser to continue and finalize

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 continuance 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 Company's 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.