Either extracted from the Dead Sea and allowed to dry out, or mined in the adjacent rock. It was an essential preservative and salt became synonymous for a power for good—hence the disciples could be called ‘salt of the earth’ (Matt. 5: 13).
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"salt." In A Dictionary of the Bible. Ed. W. R. F. Browning. Oxford Biblical Studies Online. Nov 28, 2015. <http://www.oxfordbiblicalcstudies.com/article/opr/t94/e1661>.
"salt." In A Dictionary of the Bible. , edited by W. R. F. Browning. Oxford Biblical Studies Online, http://www.oxfordbiblicalcstudies.com/article/opr/t94/e1661 (accessed Nov 28, 2015).