KAPSNER, Justice.
[¶ 1] Joe Waldock appeals from a summary judgment quieting title to 25 percent of the mineral interests under a tract of land in Mountrail County in the successors in interest of the Estate of William C. Edwardson. Waldock argues the district [757]*757court erred in deciding a 1954 administrator’s deed from Edwardson’s Estate to Waldoek’s predecessor in interest, Clark Van Horn, was equivalent to a quitclaim deed and in deciding the rule for interpreting mineral conveyances from Duhig v. Peavy-Moore Co., 135 Tex. 503, 144 S.W.2d 878 (1940), was not applicable to the administrator’s deed. We conclude the legal effect of the plain language of the administrator’s deed conveyed 25 percent of the mineral interests to Waldock’s predecessor in interest and reserved 25 percent of the mineral interests to Edward-son’s Estate. We affirm.
I
[¶ 2] When he died, Edwardson owned 50 percent of the mineral interests under a tract of land in Mountrail County and the United States owned the other 50 percent of the mineral interests. After obtaining a county court order approving and confirming the sale, the administrator of Edward-son’s Estate issued an administrator’s deed to Van Horn in 1954, which “granted, bargained, sold and conveyed” all the right, title, estate, and interest of Edward-son in the land at the time of his death to Van Horn, but excepted and reserved to Edwardson’s Estate 25 percent of all the minerals under the land:
NOW, THEREFORE, the said party of the first part as Administrator aforesaid pursuant to the order last aforesaid, and for and in consideration of the said sum of Four Thousand Seven Hundred ($4700.00) and no/100 Dollars, to his in hand paid by the said party of the second part, the receipt whereof is hereby acknowledged, has granted, bargained, sold and conveyed, and by these presents does grant, bargain, sell and convey, unto the said party of the second part and his heirs and assigns, forever, all the right, title, estate and interest, of the said above named decedent, at the time of his death, and also all the right, title, and interest that the said estate, by operation of law or otherwise, may have acquired other than or in addition to, that of said deceased, at the time of his death, in and to all that certain lot, piece or parcel of land, situated, lying and being in said County of [Mountrail] and State of North Dakota and particularly described as follows, to-wit:
The East half of the Southwest Quarter (E1/2SW1/4) and Lots Three (3) and Four (4) Section Eighteen (18), Township One Hundred Fifty-one North (151N), Range Ninety West (90W) excepting and reserving unto said estate, its successors and assigns, forever, an undivided Twenty-five percent (25%) interest in all of the oil, gas, and other minerals upon, or in said land, together with such rights of ingress and egress as may be necessary for exploring for and mining or otherwise extracting and carrying away the same; and provided further that the purchaser shall settle for summerfallow and other like improvements upon the said land. (Emphasis added.)
[¶ 3] Van Horn’s successor in interest, Waldock, brought this quiet title action against the Estate’s successors in interest to determine ownership of the 25 percent interest in the minerals excepted and reserved to the Estate in the administrator’s deed. On motions for summary judgment, the district court decided the plain language of the administrator’s deed was equivalent to a quitclaim deed, which reserved 25 percent of the mineral interests to the Estate and granted Van Horn 25 percent of the mineral interests. The court decided the language in the administrator’s deed did not result in an overcon-veyance of mineral interests to Van Horn and the rule for interpreting mineral con[758]*758veyances from Duhig, 135 Tex. 503, 144 S.W.2d 878, was not applicable to the administrator’s deed. The court decided Waldock was not entitled to any portion of the 25 percent interest in the minerals excepted and reserved to the Estate in the administrator’s deed and quieted title to that 25 percent interest to the Estate’s successors in interests.
II
[¶ 4] The district court decided this case by summary judgment under N.D.R.Civ.P. 56(c), which is a procedural device for promptly and expeditiously disposing of an action without a trial if either litigant is entitled to judgment as a matter of law and if no dispute exists as to either the material facts or the inferences to be drawn from undisputed facts, or if resolving factual disputes will not alter the result. Melchior v. Lystad, 2010 ND 140, ¶ 7, 786 N.W.2d 8. Whether a district court properly granted summary judgment is a question of law that we review de novo on the record. Id.
III
[¶ 5] Waldock argues the district court erred in equating the administrator’s deed to a quitclaim deed. He argues the administrator’s deed is more than a quitclaim deed and includes a warranty of title in the nature of a special warranty deed. He claims the deed resulted in an overconveyance of minerals by the Estate and rendered inoperative the Estate’s purported reservation of a 25 percent interest in all the minerals. He thus argues the legal effect of the deed under the Duhig rule entitles him to the 25 percent interest in the minerals reserved to the Estate.
[¶ 6] In Carkuff v. Balmer, 2011 ND 60, ¶ 8, 795 N.W.2d 303, we recently described rules for construing deeds:
In construing a deed, the primary purpose is “to ascertain and effectuate the grantor’s intent, and deeds are construed in the same manner as contracts.” State Bank & Trust of Kenmare v. Brekke, 1999 ND 212, ¶ 12, 602 N.W.2d 681; see Williams Co. v. Hamilton, 427 N.W.2d 822, 823 (N.D.1988). If a deed is unambiguous, this Court determines the parties’ intent from the instrument itself. See Brekke, at ¶ 12; Stracka v. Peterson, 377 N.W.2d 580, 582 (N.D.1985). In other words, “[t]he language of the deed, if clear and explicit, governs its interpretation; the parties’ mutual intentions must be ascertained from the four corners of the deed, if possible.” North Shore, Inc. v. Wakefield, 530 N.W.2d 297, 300 (N.D.1995); see N.D.C.C. §§ 9-07-02, 9-07-03, 9-07-04, 47-09-11. Whether or not a contract is ambiguous is a question of law. Brekke, at ¶ 12.
[¶ 7] In cases involving an overconveyance of mineral interests in deeds, this Court has applied the rule of construction from Duhig. See Melchior, 2010 ND 140, ¶ 8, 786 N.W.2d 8; Gawryluk v. Poynter, 2002 ND 205, ¶ 11, 654 N.W.2d 400; Miller v. Kloeckner, 1999 ND 190, ¶ 9, 600 N.W.2d 881; Acoma Oil Corp. v. Wilson, 471 N.W.2d 476, 478-82 (N.D.1991); Mau v. Schwan, 460 N.W.2d 131, 133-36 (N.D.1990); Sibert v. Kubas, 357 N.W.2d 495, 496-98 (N.D.1984); Kadrmas v. Sauvageau,
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KAPSNER, Justice.
[¶ 1] Joe Waldock appeals from a summary judgment quieting title to 25 percent of the mineral interests under a tract of land in Mountrail County in the successors in interest of the Estate of William C. Edwardson. Waldock argues the district [757]*757court erred in deciding a 1954 administrator’s deed from Edwardson’s Estate to Waldoek’s predecessor in interest, Clark Van Horn, was equivalent to a quitclaim deed and in deciding the rule for interpreting mineral conveyances from Duhig v. Peavy-Moore Co., 135 Tex. 503, 144 S.W.2d 878 (1940), was not applicable to the administrator’s deed. We conclude the legal effect of the plain language of the administrator’s deed conveyed 25 percent of the mineral interests to Waldock’s predecessor in interest and reserved 25 percent of the mineral interests to Edward-son’s Estate. We affirm.
I
[¶ 2] When he died, Edwardson owned 50 percent of the mineral interests under a tract of land in Mountrail County and the United States owned the other 50 percent of the mineral interests. After obtaining a county court order approving and confirming the sale, the administrator of Edward-son’s Estate issued an administrator’s deed to Van Horn in 1954, which “granted, bargained, sold and conveyed” all the right, title, estate, and interest of Edward-son in the land at the time of his death to Van Horn, but excepted and reserved to Edwardson’s Estate 25 percent of all the minerals under the land:
NOW, THEREFORE, the said party of the first part as Administrator aforesaid pursuant to the order last aforesaid, and for and in consideration of the said sum of Four Thousand Seven Hundred ($4700.00) and no/100 Dollars, to his in hand paid by the said party of the second part, the receipt whereof is hereby acknowledged, has granted, bargained, sold and conveyed, and by these presents does grant, bargain, sell and convey, unto the said party of the second part and his heirs and assigns, forever, all the right, title, estate and interest, of the said above named decedent, at the time of his death, and also all the right, title, and interest that the said estate, by operation of law or otherwise, may have acquired other than or in addition to, that of said deceased, at the time of his death, in and to all that certain lot, piece or parcel of land, situated, lying and being in said County of [Mountrail] and State of North Dakota and particularly described as follows, to-wit:
The East half of the Southwest Quarter (E1/2SW1/4) and Lots Three (3) and Four (4) Section Eighteen (18), Township One Hundred Fifty-one North (151N), Range Ninety West (90W) excepting and reserving unto said estate, its successors and assigns, forever, an undivided Twenty-five percent (25%) interest in all of the oil, gas, and other minerals upon, or in said land, together with such rights of ingress and egress as may be necessary for exploring for and mining or otherwise extracting and carrying away the same; and provided further that the purchaser shall settle for summerfallow and other like improvements upon the said land. (Emphasis added.)
[¶ 3] Van Horn’s successor in interest, Waldock, brought this quiet title action against the Estate’s successors in interest to determine ownership of the 25 percent interest in the minerals excepted and reserved to the Estate in the administrator’s deed. On motions for summary judgment, the district court decided the plain language of the administrator’s deed was equivalent to a quitclaim deed, which reserved 25 percent of the mineral interests to the Estate and granted Van Horn 25 percent of the mineral interests. The court decided the language in the administrator’s deed did not result in an overcon-veyance of mineral interests to Van Horn and the rule for interpreting mineral con[758]*758veyances from Duhig, 135 Tex. 503, 144 S.W.2d 878, was not applicable to the administrator’s deed. The court decided Waldock was not entitled to any portion of the 25 percent interest in the minerals excepted and reserved to the Estate in the administrator’s deed and quieted title to that 25 percent interest to the Estate’s successors in interests.
II
[¶ 4] The district court decided this case by summary judgment under N.D.R.Civ.P. 56(c), which is a procedural device for promptly and expeditiously disposing of an action without a trial if either litigant is entitled to judgment as a matter of law and if no dispute exists as to either the material facts or the inferences to be drawn from undisputed facts, or if resolving factual disputes will not alter the result. Melchior v. Lystad, 2010 ND 140, ¶ 7, 786 N.W.2d 8. Whether a district court properly granted summary judgment is a question of law that we review de novo on the record. Id.
III
[¶ 5] Waldock argues the district court erred in equating the administrator’s deed to a quitclaim deed. He argues the administrator’s deed is more than a quitclaim deed and includes a warranty of title in the nature of a special warranty deed. He claims the deed resulted in an overconveyance of minerals by the Estate and rendered inoperative the Estate’s purported reservation of a 25 percent interest in all the minerals. He thus argues the legal effect of the deed under the Duhig rule entitles him to the 25 percent interest in the minerals reserved to the Estate.
[¶ 6] In Carkuff v. Balmer, 2011 ND 60, ¶ 8, 795 N.W.2d 303, we recently described rules for construing deeds:
In construing a deed, the primary purpose is “to ascertain and effectuate the grantor’s intent, and deeds are construed in the same manner as contracts.” State Bank & Trust of Kenmare v. Brekke, 1999 ND 212, ¶ 12, 602 N.W.2d 681; see Williams Co. v. Hamilton, 427 N.W.2d 822, 823 (N.D.1988). If a deed is unambiguous, this Court determines the parties’ intent from the instrument itself. See Brekke, at ¶ 12; Stracka v. Peterson, 377 N.W.2d 580, 582 (N.D.1985). In other words, “[t]he language of the deed, if clear and explicit, governs its interpretation; the parties’ mutual intentions must be ascertained from the four corners of the deed, if possible.” North Shore, Inc. v. Wakefield, 530 N.W.2d 297, 300 (N.D.1995); see N.D.C.C. §§ 9-07-02, 9-07-03, 9-07-04, 47-09-11. Whether or not a contract is ambiguous is a question of law. Brekke, at ¶ 12.
[¶ 7] In cases involving an overconveyance of mineral interests in deeds, this Court has applied the rule of construction from Duhig. See Melchior, 2010 ND 140, ¶ 8, 786 N.W.2d 8; Gawryluk v. Poynter, 2002 ND 205, ¶ 11, 654 N.W.2d 400; Miller v. Kloeckner, 1999 ND 190, ¶ 9, 600 N.W.2d 881; Acoma Oil Corp. v. Wilson, 471 N.W.2d 476, 478-82 (N.D.1991); Mau v. Schwan, 460 N.W.2d 131, 133-36 (N.D.1990); Sibert v. Kubas, 357 N.W.2d 495, 496-98 (N.D.1984); Kadrmas v. Sauvageau, 188 N.W.2d 753, 756 (N.D.1971).
[¶ 8] We have explained the Duhig rule:
In 1 Williams & Meyers Oil and Gas Law, § 311, p. 580.39 (2001) the authors explain the Duhig rule:
The Duhig rule says that where a grantor conveys land in such a manner as to include 100% of the minerals, and then reserves to himself 50% of the minerals, the reservation is not [759]*759operative where the grantor owns only 50% of the minerals. The deed is construed as undertaking the transfer of 50% of the minerals to the grantee. Both this grant and the reservation cannot be given effect, so the grantor loses because the risk of title loss is on him.
The effect of Duhig is that a grantor cannot grant and reserve the same mineral interest, and if a grantor does not own a large enough mineral interest to satisfy both the grant and the reservation, the grant must be satisfied first because the obligation incurred by the grant is superior to the reservation. The interpretation of deeds within the framework of the Duhig rationale provides certain and definite guidelines in the interpretation of property conveyances and in title examinations. See 1 Williams & Meyers, at § 313, p. 616-616.1.
This Court’s application of Duhig has been based on estoppel by warranty, a subset of estoppel by deed, which precludes a warrantor of title from questioning the title warranted. Miller v. Kloeckner, 1999 ND 190, ¶13, 600 N.W.2d 881 (citing Mau v. Schwan, 460 N.W.2d 131, 134 (N.D.1990)). See also Acoma Oil Corp. v. Wilson, 471 N.W.2d 476, 479-80 (N.D.1991); Sibert v. Kubas, 357 N.W.2d 495, 497 (N.D.1984). In Miller, at ¶ 16-18 we recognized the rationale from Duhig may apply to a deed with no warranty provisions, and the key question is not what the grantor purported to retain for himself, but what the grantor purported to give the grantee. See 1 Williams & Meyers, at § 311, p. 580.34.
Gawryluk, 2002 ND 205, ¶¶ 13-14, 654 N.W.2d 400.
[¶ 9] In Miller, 1999 ND 190, ¶¶ 14-18, 600 N.W.2d 881, this Court addressed a Duhig issue in the context of an argument that a grantor used a special warranty deed to convey land to a grantee. We said the granting clause defines and designates the conveyed land, and we explained exceptions in a covenant of warranty protect the grantor on the warranty and are not intended as limitations on the nature of the interest conveyed by the granting clause. Id. at ¶ 15. We explained a “Duhig result may be reached with a limited warranty or with no warranty,” because the relevant inquiry focuses on what the grantor purported to convey to the grantee in the granting clause. Miller, at ¶¶ 16-17.
[¶ 10] Here, the administrator’s deed complied with the contemporaneous statutory provision for an estate’s conveyance of real property by a private sale. See 1943 N.D.R.C § 30-1920. See also Sittner v. Mistelski, 140 N.W.2d 360, 369 (N.D.1966) (stating N.D.C.C. § 30-19-20 clearly indicates conveyance of decedent’s real property by decedent’s estate conveys only the right, title, and interest of the decedent in the premises). Although Wal-dock argues the administrator’s deed contains a warranty and is more than a quitclaim deed and is in the nature of a special warranty deed, the label of the deed is not controlling. Rather, the specific language of the granting clause of the deed controls the interests the grantor purported to give the grantee. See Gawryluk, 2002 ND 205, ¶ 14, 654 N.W.2d 400; Miller, 1999 ND 190, ¶¶ 16-17, 600 N.W.2d 881.
[¶ 11] The plain language of the Estate’s deed to Waldock’s predecessor in interest grants all the right, title, estate, and interest of the decedent at the time of his death. That language is similar to a quitclaim deed, which conveys only the grantor’s interest, if any, in property. See Carkuff, 2011 ND 60, ¶ 10, 795 N.W.2d 303. In Carkuff, at ¶¶ 7, 12-14, a quitclaim deed used the word “grant,” and we [760]*760held the use of that word did not transform the deed to a conveyance of more than the grantor’s right, title, and interest in the property. .
[¶ 12] Although the language in the deed in Carkuff is not identical to the language in this deed, the legal effect of the plain language in this deed is the same as the language in Carkuff That language conveyed Edwardson’s interest in the property at the time of his death, which undisputedly included 50 percent of the mineral interests, and excepted and reserved to his Estate 25 percent of the mineral interests. The language excepting and reserving 25 percent of the mineral interests to the Estate in this deed is in the granting clause, not in a later clause. See Royse v. Easter Seal Soc’y, 256 N.W.2d 542, 545 (N.D.1977) (stating that to constitute an exception to a grant, exception must be an exception to the grant and not an exception to some other provision of deed).
[¶ 13] We conclude the specific language of the deed granting, bargaining, selling, and conveying “all the right, title, estate and interest of [Edwardson], at the time of his .death” is clear and unambiguous, and the legal effect of that language conveyed 25 percent of Edwardson’s interests in the minerals to Waldock’s predecessor in interest and excepted and reserved 25 percent of Edwardson’s interest in the minerals to his Estate for his successors in interest. We therefore conclude the plain language of the deed did not result in an overconveyance of mineral interests and the Duhig rule for construing over conveyances is not applicable to the deed.
IV
[¶ 14] We affirm the summary judgment.
[¶ 15] GERALD W. VANDE WALLE, C.J., MARY MUEHLEN MARING, DANIEL J. CROTHERS, and DALE V. SANDSTROM, JJ., concur.