(Written by Colonel J.C. Fremont in 1847 (and updated in 1852) about his explorations and observations of California during the Gold Rush.)
From the mill Mr. Marshall guided me up the mountain on the opposite or north bank of the south fork, where, in the bed of small streams or ravines, now dry, a great deal of coarse gold has been found. I there saw several parties at work, all of whom were doing very well; a great many specimens were shown me, some as heavy as four or five ounces in weight, and I send three pieces labelled No. 5, presented by a Mr. Spence. You will perceive that some of the specimens accompanying this, hold mechanically pieces of quartz; that the surface is rough and evidently moulded in the crevice of a rock. This gold cannot have been carried far by water, but must have remained near where it was first deposited from the rock that once bound it. I inquired of many people if they had encountered the metal in its matrix, but in every instance they said they had not, but that the gold was invariably mixed with washed gravel or lodged in the crevices of other rocks. All bore testimony that they had found gold in greater or less quantities in the numerous small gullies or ravines that occur in that mountainous region.
On the 7th of July I left the mill, and crossed to a stream emptying into the American fork, three or four miles below the saw mill. I struck this stream (now known as Weber's creek) at the washings of Sunol & Co. They had about thirty Indians employed, whom they payed in merchandise. They were getting gold of a character similar to that found on the main fork, and doubtless in sufficient quantities to satisfy them. I send you a small specimen, presented by this company, of their gold. From this point we proceeded up the stream about eight miles, where we found a great many people and Indians--some engaged in the bed of the stream, and others in the small side valleys that put into it. These latter are exceedingly rich, and two ounces were considered an ordinary yield for a day's work. A small gutter, not more than a hundred yards long by four feet wide and two or three feet deep, was pointed out to me as the one where two men-- William Daly and Parry McCoon--had, a short time before, obtained 17,000 dollars worth of gold. Capt. Weber informed me that he knew that these two men had employed four white men and about a hundred Indians, and that at the end of one week's work, they paid off their party, and had left $10,000 worth of this gold. Another small ravine was shown me, from which had been taken upwards of $12,000 worth of gold. Hundreds of similar ravines to all appearances are as yet untouched. I could not have credited these reports had I not seen, in the abundance of the precious metal, evidence of their truth.