Within 45 days after the last publication of the notice referred to in §11. 31 of this title (relating to Public Notice), the commission shall determine considering any objections which have been filed, if the application is of significance sufficient to warrant a public hearing. Notice of the date, time, nature of the hearing, location of such public hearing, a statement of the legal authority and jurisdiction under which the hearing is to be held, a reference to the particular sections of the statutes and rules involved and a short and plain statement of the matters asserted, shall be published by the commission in the newspaper of greatest general circulation in the locality at least once a week for three consecutive weeks prior to the scheduled hearing date, which date shall be set within 30 days after determination that a public hearing is warranted. The same notice shall also be mailed to the applicant or petitioner, and to all persons who have expressed by written notification to the commission an interest in the pending permit application, revision, renewal, transfer, petition for designation of lands unsuitable for surface mining, or application for release or reduction of a performance bond and to any other person who, in the opinion of the commission, should be notified.