Nothing of importance has happened since I last wrote you, except that I have become a miner. I can truly say that I am sorry I “learned the trade,” for I wet my feet, tore my dress, spoilt a pair of new gloves, nearly froze my fingers, got an awful headache, took cold, and lost a valuable pin in this, my labor of love. I myself thought . . . that one had but to stroll gracefully along romantic stream . . . and to stop now and then to . . . carelessly rinse out a small panful of yellow sand in order to fill one’s work bag with the . . . precious mineral. Since I have been here, I have discovered my mistake. . . . . . . To be sure, there are now and then “lucky strikes.” Once a person took $256 out of a single basinful of soil. But such luck is as rare as the winning of a $100,000 prize in a lottery. We are acquainted with many here whose gains have never amounted to much more than wages:—that is, from $6 to $8 a day.
--Louise Amelia Clappe, letter of November 25, 1851
What is the purpose of the passage? Use textual evidence to support your answer.