B2Gold is trading 5% down at $5.21 as gold prices sold off sharply on September 28. - Spot gold fell 2.7% to $4,171.85 per ounce; Reuters cited rising oil prices, inflation concerns and expectations of further Federal Reserve rate hikes. - B2Gold announced positive Goose Mine operating and exploration updates, but did not identify a cause for the share-price decline. - Available evidence points to pressure from the gold-market backdrop, not a confirmed company-specific catalyst.