This bill pertains to the regulation of blasting operations by quarries in Limestone County, Alabama. It stipulates that, following the effective date of the act, quarries are prohibited from conducting blasting operations within one and one half miles of any building or structure that is designated as a historical building and site, as defined in Section 40-8-1 of the Code of Alabama 1975. This regulation applies only to quarries that are located outside the corporate limits of any municipality.

However, there is an exception to this rule. The prohibition on blasting operations does not apply to quarries that were already in existence on the effective date of this act. This means that only new quarries, or those that commence operations after the act comes into effect, will be subject to this new restriction. The act is set to become effective immediately upon its enactment. There are no insertions or deletions indicated in the provided text of the bill.