Orosur Mining Inc Announces Operational Update, Brazil

• Sampling and mapping program commenced at Ariquemes.
• Alluvial program to test effectiveness of regional work.
• Mapping north of Bom Futuro identifies mineralised granites - samples submitted for assay.

LONDON, UK / ACCESSWIRE / July 5, 2023 / Orosur Mining Inc. ("Orosur" or the "Company") (TSXV:OMI)(/AIM:OMI), is pleased to provide an update on the progress of exploration activities at its Ariquemes Tin Project ("Ariquemes Project" or the "Project") in Brazil.

The Ariquemes Project is a large-scale tin (and associated metals) exploration project in Rondonia State, Brazil, entirely within the world class Ariquemes Tin Field. The Project comprises a large number of granted licences and applications that in total cover more than 3,000km², representing the largest land holding in this key mining district.

Ariquemes Project is a joint venture with Canadian listed Meridian Mining UK (TSXV: MNO) ("JV"), whereby Orosur has the right to earn a 75% stake in the Project by investing US$4m in exploration over a four-year period in two stages.

As announced on May 4^th, 2023, a regional stream sediment program was recently completed across the entire licence area. The rationale for this program was to cover the area as quickly and as efficiently as possible and identify key higher priority zones for follow-up. This objective was successful with large areas of tin and niobium anomalism being mapped. As a result, the Company has now decided to move to the next phase.

As part of the next phase, two prospects were targeted for small work programs designed to address several key geological questions. The work programs include:

1. carrying out more detailed work in one key licence area to assess the effectiveness of the regional sampling program;
2. if successful, identifying as quickly as possible, a body of mineralisation that demonstrates the economic potential of the region and underpins further work; and
3. exploring the northeast of the large Bom Futuro mine for possible extensions or repetitions.

Foto: Accesswire

Oriente Novo

The Oriente Novo licence is to the far east of the main lease package.

This licence was chosen as the most attractive site for the next phase of work for several reasons:

• the area returned several stream sediment samples, highly anomalous in both tin and niobium;
• being recently granted (unlike many other licences which remain unpublished or awaiting renewal), ground disturbing activities such as drilling are permitted;
• there was substantial historical mining both north and south of the lease (stopping at the boundary), both from primary hard rock and secondary alluvial sources;
• these two historical mining areas are connected by a long drainage system, over 6km of which is within the licence area, that contained the anomalous stream sediment samples; and
• the licence contains over 15km of additional drainages that have shown anomalous results and may be the target of additional work in the future.

A small, handheld, mechanised auger drill will be used to take samples down to 5m (with a sample collected at every metre) to test the presence of surface mineralisation along the length of this drainage system (Figure 2). In addition, at regular intervals, the auger will be pushed down to its capacity of 20m to test the depth potential of the drainage system.