25 CFR § 900.18
What happens if a proposal is not declined within 90 days after it is received by the Secretary?
February 24, 2021
A proposal that is not declined within 90 days (or within any agreed extension under §900.17) is deemed approved and the Secretary shall award the contract or any amendment or renewal within that 90-day period and add to the contract the full amount of funds pursuant to section 106(a) of the Act.