tract or parcel of land
(3) The term tract or parcel of land is merely descriptive of the physical scope of the land to which the taxpayer's interest relates. It is not descriptive of the nature of his rights or interests in the land. All contiguous areas (even though separately described) included in a single conveyance or grant or in separate conveyances or grants at the same time from the same owner constitute a single separate tract or parcel of land. Areas included in separate conveyances or grants (whether or not at the same time) from separate owners are separate tracts or parcels of land even though the areas described may be contiguous. If the taxpayer's rights or interests within the same tract or parcel of land are dissimilar, then each such dissimilar interest constitutes a separate property. If the taxpayer's rights or interests (whether or not dissimilar) within the same tract or parcel of land relate to more than one separate mineral deposit, then his interest with respect to each such separate deposit is a separate property.