Name: Jokisivu mine.

Location: The Jokisivu mine is located about 40 km south-west of the Vammala plant, in the municipality of Huittinen, in southern Finland.

Mine Owner/s: Dragon Mining.

Brief Description: Jokisivu comprises the Kujankallio and Arpola deposits, which are about 200 m apart.

Brief History: The first indication of gold mineralisation in the Jokisivu area was obtained in 1964, when a local youth sent a gold-bearing boulder to an ore-prospecting competition.

Outokumpu Oy began exploring the area in 1985 and continued sporadically until 2003 when Dragon Mining acquired the project. Dragon Mining advanced the project over the years that followed, with production starting in 2009. 

Production from the Jokisivu mine started with openpit mining of the near surface portion of the Kujankallio deposit in September 2009. A portal for the decline was established at the eastern most end of the openpit at a depth of 35 m.

The near-surface portion of the Arpola deposit was also mined using openpit methods in 2011. Underground development of the Kujankallio deposit started in 2010 and at Arpola in 2014.

Primary Metals: Gold.

Secondary Metals: None stated.

Geology/Mineralisation: The Jokisivu deposits represent structurally controlled orogenic gold systems located within the Palaeoproterozoic Vammala migmatite belt. Gold mineralisation at the Kujankallio and Arpola deposits is hosted within relatively undeformed and unaltered diorite, in 1-m- to 5-m-wide shear zones that are characterised by laminated, pinching and swelling quartz veins.

The Kujankallio deposit has been shown by drilling to be  530 m deep, while Arpola deposit is defined by drilling over a 310 m vertical extent from surface. Both deposits remain open at depth and partially along strike.

Reserves: Total proven and probable mineral reserves as at December 31, 2018, were estimated at 1.38-million tonnes grading 2.5 g/t gold.

Resources: Total mineral resources as at December 31, 2018, were estimated at 2.14-million tonnes grading 4.1 g/t gold.

Mining Method: Openpit and underground.

Major Infrastructure and Equipment: Gold concentrate is processed at Dragon Mining’s Svartliden plant – a carbon-in-leach facility that has a processing capacity of about 300 000 t/y, in northern Sweden.

Prospects: The extensions of the Kujankallio and Arpola deposits and associated satellite zones continue to be evaluated.

Contact Details:
Dragon Mining
Tel +61 8 6311 8000
Email admin@dragonmining.com
Website http://www.dragonmining.com