A valuable lead mine is said to have been lately discovered in Cumberland, below the mouth of Red river. The greatest, however, known in the western country, are on the Mississippi, extending from the mouth of Rock river one hundred and fifty miles upwards. These are not wrought, the lead used in that country being from the banks on the Spanish side of the Mississippi, opposite to Kaskaskia. A mine of copper was once opened in the county of Amherst, on the north side of James' river, and another in the opposite country, on the south side. However, either from bad management or the poverty of the veins, they were discontinued. We are told of a rich mine of native copper on the Ouabache, below the upper Wiaw. The mines of iron worked at present are Callaway's, Ross's, and Ballendine's, on the south side of James' river; Old's on the north side, in Albemarle; Miller's in Augusta, and Zane's in Frederic. These two last are in the valley between the Blue Ridge and North mountain. Callaway's, Ross's, Miller's, and Zane's make about one hundred and fifty tons of bar iron each, in the year. Ross's makes also about sixteen hundred tons of pig iron annually; Ballendine's one thousand; Callaway's, Miller's, and Zane's, about six hundred each. Besides these, a forge of Mr. Hunter's, at Fredericksburg, makes about three hundred tons a year of bar iron, from pigs imported from Maryland; and Taylor's forge on Neapsco of Potomac, works in the same way, but to what extent I am not informed. The indications of iron in other places are numerous, and dispersed through all the middle country. The toughness of the cast iron of Ross's and Zane's furnaces is very remarkable. Pots and other utensils, cast thinner than usual, of this iron, may be safely thrown into, or out of the wagons in which they are transported. Salt-pans made of the same, and no longer wanted for that purpose, cannot be broken up, in order to be melted again, unless previously drilled in many parts. In the western country, we are told of iron mines between the Muskingum and Ohio; of others on Kentucky, between the Cumberland and Barren rivers, between Cumberland and Tennessee, on Reedy creek, near the Long Island, and on Chesnut creek, a branch of the Great Kanhaway, near where it crosses the Carolina line. What are called the iron banks, on the Mississippi, are believed, by a good judge, to have no iron in them. In general, from what is hitherto known of that country, it seems to want iron. Considerable quantities of black lead are taken occasionally for use from Winterham in the county of Amelia. I am not able, however, to give a particular state of the mine. There is no work established at it; those who want, going and procuring it for themselves.