$7.6 mill in working capital

Can somebody please explain why $7.6 mill is required for working capital? And what actually constitutes working capital?

From my understanding this CR was only meant to cover the costs of extending the decline down to Mako ($5.1 mill).

Is it the mining costs to get the 1000-3000 ounces? Best case scenario they're only going to get around $4.5 mill for 3000 ounces (at $1500/ounce)

Is CGT raising $7.6 mill to make $4.5 mill??