130R169. Where one or more properties of a taxpayer are included in Class 28 in Schedule B and some or all of the properties, referred to in this section as “single mine properties”, were acquired for the purpose of gaining or producing income from one mine and not from any other mine, a separate class is prescribed for the single mine properties that(a) were acquired for the purpose of gaining or producing income from that mine only;
(b) would otherwise be included in Class 28 in that schedule; and
(c) are not included in a separate class because of section 130R170.