Not far from this stele stood one that was set up by Horoura, describing an expedition which reached the mines in hot weather. “The desert burnt like summer; the mountains burnt like fire; the vein seemed exhausted; the overseer questioned the miners; the skilled workers who knew the mine replied, There is turquoise to all eternity in the mountain, and at that moment it appeared.”[53] The reference is to the turquoise mines opened by Amen-em-hat II, which were now further developed. The neck of rock which contained the turquoise had hitherto been worked from the north. This neck of rock was now attacked from the south, and, as the work became complex, a shaft of about ten feet square was sunk from above, which brought light and air into the passages. This shaft was wrongly described by some travellers as a reservoir. The passages eventually extended about 220 feet into the rock. A great inscription on the rock, near the chief opening, gives an idea of the offerings which the Egyptians made at the sanctuary at this time; evidently in return for the permission to work here. It mentions “a thousand loaves, jars of beer, cattle, fowls, incense, ointment, and everything on which the gods live.” The offerings in this case were presented by Sebek-her-heb, chief chamberlain, who declared, “I excavated a mine-chamber for my lord, the workmen came in full quota, never was there any neglect.”[54] The same Sebek-her-heb erected the stele of the 44th year of Amen-em-hat III on the plateau. It is inscribed on one side only and stands in a rough stone enclosure with a flat stone at the base. The inscription runs “a royal offering to Hathor, mistress of turquoise (_mafkat_), for the family spirit (_ka_) of the chief chamberlain Sebek-her-heb, and the _ka_ of the seal-bearer, deputy of the overseer of seal-bearers, Kemnaa, born of Ka-hotep.”[55] Another inscription of the 45th year of Amen-em-hat III, named Ptahwer, triumphant, who described himself as “delivering the Anu Sut (eastern foreigners) to the Pharaoh, and bringing the Mentu to the halls of the king.”[56] During the reign of Amen-em-hat III the caves at Serabit were re-modelled to their present shape. The larger cave, without the recesses, now measures 20 by 10 feet. A square pillar of rock was left standing in its centre as a support to the roof. On one side of this pillar the Pharaoh was represented facing the goddess Hathor, wearing a high head-dress, who held out to him a sceptre. Beneath this scene Khenum-su, Ameny-seneb, seal-bearer, and other officials were seen.[57] The walls of the cave at the same time were smoothed and inscribed with mortuary prayers. But their surface for the most part has crumbled away, perhaps owing to intentional desecration, and the inscriptions are lost.