What is the fine-grained topic of the following text: The Company also agreed to revise the Tranche 2 Purchase Date to March 8, 2016 in the note purchase agreement dated October 30, 2015 between the Company and Resource Capital Fund VI L.P. related to the 8% interest bearing convertible note issuable to RCF VI in the principal amount of US$11,000,000. Only return the topic.
Revision of Tranche 2 Purchase Date in the Note Purchase Agreement between the Company and Resource Capital Fund VI L.P.