Sept 8 (Reuters) - First Quantum Minerals Ltd FM.TO
* First Quantum Minerals and Franco-Nevada Corp agree terms for additional precious metals stream agreement
* First Quantum Minerals Ltd - US$178 million purchase price will be paid as a one-time advance payment upon closing of transaction
* First Quantum Minerals Ltd - no additional pro-rata funding will apply to additional stream
* First Quantum Minerals Ltd - intends to use proceeds to fund entire first installment of acquisition of interest in Cobre Panama from LS-Nikko Copper