Metal Tiger said it had sold part of its holding in Australian-based mining company Kingsgate Consolidated, generating gross proceeds of A$2.7m (£1.5m).
The share sale brought Metal Tiger's interest in the group down to 5.15%.
"Metal Tiger has taken the prudent decision to de-risk our Kingsgate investment by partially selling down and booking a profit," chief executive Michael McNeilly said.
"It does not, however, mean we are going away. We still retain more than 5% of Kingsgate and will be watching the board closely to see if they deliver on what they have promised."
In the meantime, Metal Tiger said it was turning the bulk of its attention to its copper-sliver joint venture with MOD in Botswana.
At 9:49am: (LON:MTR) Metal Tiger Plc Ord 0.01p share price was 0p at 2.3p