All quarries which have been abandoned and are not actively operated shall be enclosed by a fence not less than 6 feet in height. Said fence:to be constructed in such manner and of such materials as in the judgment of the Commissioner of Housing and Community Development will prevent any persons from entering upon the said quarry; and to be provided with a gate which shall be securely closed, except at such times when persons duly authorized persons are upon said premises. City Code, 1927, art. 32, §125 1950, art. 24, §168 1966, art. 19, §105 1976/83, art. 19, §123 Ord. 24-231 Ord. 77-573