Resolute will now incur an income tax of 25% rather than 35%, with the "tax stability regime" signed also protecting against future adverse changes and ensuring that should a more favourable tax regime become available, the ASX-listed company will have the option to adopt.
Resolute has an 80% stake in Syama, with the Mali having the balance.
Total royalties payable are to remain at 6% and the joint venture "will also remain exempt from Malian Customs Duty on the importation of fuel which based on current consumption equates to an annual saving of about US$20million (equivalent to $0.40 per litre)".
A new mining convention was due to be signed after the original one signed in the late 1980s expired.
Underpinned by a large new automated underground mine, Resolute aims to produce about 300,000 ounces per annum for 14 years at Syama at all in sustaining costs of $746/oz.
Shares in Resolute were unchanged at A$1.16 in early trade, capitalising the company at $883 million.