Any proceedings heretofore, and since April 24, 1935, had in any district court in connection with the sale and execution of an oil, gas or other mineral lease by an administrator, executor or guardian, and any such lease sold and executed in pursuance thereof, which proceedings and lease are in substantial conformity herewith, are hereby declared to be valid the same as if this act had been in force at the date of said proceedings and lease.
Okla. Stat. tit. 58, § 927