land around each well or mine producing, and each well or mine being drilled or developed at time of first extension, to-wit: April 1, 1945.”
It seems to us inescapable that that condition made the period for which the servitude was established indefinite and uncertain. At the time the parties entered into the contract it could not be known whether that condition would be met. The event was not “in the course of nature, certain”.8
Successive conditions, likewise indefinite and uncertain, are provided in the succeeding paragraph:
“ said right to mine as previously stated shall be further extended from time to time for periods of five (5) years whenever operation during the preceding five (5) year period has been for an average of 50 days per year during this period *
At the time the servitude was established, it might extend, according to the contract, for 10 years, 15 years, 20 years or until the minerals were exhausted. The district court properly commented that, “[t]he Louisiana Supreme Court itself has told us that an ‘uncertain and indefinite duration’ is the hallmark of prescription,” and continued, “Here the hallmark is missing.” (204 F.Supp. at p. 567.) We cannot agree, but think that here the hallmark is inescapably present.
The district court pointed out many ways in which the “periods of reservation” differed from statutory prescription:
“ * There are other essential differences between the effect of these provisions and the rules of lib-erative prescription. These may be summarized:
“First, under the present contract, a large area will be released from the servitude after the expiration of ten years regardless of use or production, for only 25 acres around each well are saved in any event.
“Second, no use of the servitude short of actual production in paying quantities for at least fifty days a year for three years will preserve any part of the servitude beyond the primary term.
“Third, only production in the last three years of the primary term will renew the servitude.
“Fourth, even the requisite production at the right time will renew the servitude for only five additional years.
“These are not the characteristics of legal prescription, nor of any known contractual variant.” (204 F.Supp. at pp. 566, 567.)
There would be no need to recognize contractual prescription if it had to conform to statutory prescription. Art. 1764 of the LSA-Civil Code provides, in part, that, “All things that are not forbidden by law, may legally become the subject of, or the motive for contracts Thus, Louisiana provides for the utmost liberty to contract. We can see no reason why the contracting parties were not at liberty to prescribe the type of user which will overcome the presumption of abandonment and to require that it be a successful user. See Keebler v. Seubert, 1929, 167 La. 901, 120 So. 591, 592. We conclude that the district court erred in holding that the reservation in the deed did not provide for a contractual prescription for the conditional extinguishment of the mineral servitude which was rendered inoperative by the Louisiana statutes.
Appellees insist, however, that if the Louisiana statutes are so applied they would be unconstitutional because they would impair the obligations of the contract. Article I, Section 10 of the Constitution provides that, “No state shall pass any law impairing the obligation of contracts.” The Constitution of Louisiana contains a sim
8
Art. 2049 of LSA-Civil Code.