Sept 7 (Reuters) - Firm Capital Mortgage Investment Corp FC.TO
* Firm Capital Mortgage Investment Corp provides shareholders with update on its operating line of credit, investment portfolio size and average interest rate on its investments
* Firm Capital Mortgage Investment Corp - corporation has increased operating line of credit to $90 million
* Firm Capital Mortgage Investment Corp - all other terms within operating line of credit remain unchanged
* Firm Capital Mortgage Investment Corp - more than $20 million of $90 million credit line is available in U.S. borrowings and will pay interest based on libor plus a spread