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For the purpose of determining whether a tax authorized under this Section is applicable, a retail sale, by a producer of coal or another mineral mined in Illinois, is a sale at retail at the place where the coal or other mineral mined in Illinois is extracted from the earth. This paragraph does not apply to coal or another mineral when it is delivered or shipped by the seller to the purchaser at a point outside Illinois so that the sale is exempt under the federal Constitution as a sale in interstate or foreign commerce. Nothing in this Section shall be construed to authorize the county to impose a tax upon the privilege of engaging in any business that under the Constitution of the United States may not be made the subject of taxation by this State. (c) If a tax has been imposed under subsection (b), a service occupation tax shall also be imposed at the same rate upon all persons engaged, in the county, in the business of making sales of service, who, as an incident to making those sales of service, transfer tangible personal property within the county as an incident to a sale of service. This additional tax may not be imposed on tangible personal property taxed at the 1% rate under the Service Occupation Tax Act. Beginning December 1, 2019, this tax is not imposed on sales of aviation fuel unless the tax revenue is expended for airport-related purposes. If the county does not have an airport-related purpose to which it dedicates aviation fuel tax revenue, then aviation fuel is excluded from the tax. The county must comply SB3019 Enrolled LRB104 20255 HLH 33706 b Public Act 104-0468