Discovering precious and base metals in northern Sweden

The Arvidsjaur project (100% owned by Copperstone Resources) is located approximately 50km southeast of Arvidsjaur and 700km north of Stockholm in northern Sweden in a place we call The Arvidsjaur Project.

Geologically the project is  hosted within  volcanogenic supracrustal rocks of  Paleoproterozoic age  bound regionally by voluminous crystalline granite intrusions  which constitute the bedrock of the Fennoscandian Shield.

This undulating afforested terrain has been eroded in more recent times through repeated glacial advances and today is largely mantled by unconsolidated sediments of Quaternary age.

The project area in Granliden  also lies some 15-20km north of the famous  ENE-WSW trending Skellefte-field region that hosts more than twenty (20) volcanogenic massive sulphide ore bodies which are either being mined or were mined previously, making this one of Sweden’s major base-precious metal ore producing belts.

Identification of drilling targets in the municipal of Arvidsjaur

Extensive historical data from this project  shows widespread Cu, Au and Zn values in sulphide veins. These veins are broadly coincident with alteration styles and structural features characteristic of hydrothermal mineralising systems such as breccias.

Since the mid 2010’s, Copperstone has with increased activity explored the vast (8,000ha) property and try and unlock its true potential.  Early 2017, a first systematic deep drilling campaign  were conducted, and based on the results in combination with  50 year exploration data, two ground geophysical programmes (ground magnetics and Natural Source Audio Magnetotellurics  – NSAMT) were implemented  covering a large portion of the project area. The result was the identification of a large magnetic anomaly  partially enveloped by a well-defined zone of elevated conductivity. The central magnetic anomaly was interpreted to represent an  intrusive (possibly with elevated magnetic values due to alteration processes associated with mineralisation).

This anomaly is partly enveloped by a zone of conductivity interpreted to represent an alteration style that is common in hydrothermal copper systems. The identification of these geophysical anomalies and their spatial relationship to each other provided a high-quality drill target that corresponded to the genetic mode for exploration targets.

Drilling Campaign 2018

Encouraged by these  results the  exploration team  embarked on a drilling campaign in January 2018  aimed at testing this feature. Approximately  
7 600 m of diamond drilling was  implemented in holes of  roughly 700m each (subject to  change as dictated by the  outcome of the drilling). The campaign was a success and both  Mineral Resources and  Exploration Targets were increased significantly.  (Please refer to Press Release December 20, 2018 and  Mineral Resources).

Active exploration

Copperstone has since 2015 core drilled 12,500 meter and since 2020/21, a new regional office was installed by Arvidsjaur airport and the Company has also initiated the next phase of exploration activities with re-logging of Eva drill cores prior to geophysical exploration followed by core drilling. With the help of new technical instruments and to the background of an even more heavily rising gold price than copper during the past 20 years, the Company is investigating the gold potential (in pure arsenopyrite or/and VMS) at depth, which could potentially ease the land access in the end. The Arvidsjaur project is considered as green field, in comparison to Viscaria’s brown field (historical mine site). Regarding the environmental mitigation, it is with the current situation in mind, expected to use external enrichment rather than an in-house concentration plant, which would lower the environmental footprint from potential mining.