Was the Confederacy able to import lead? Do we have good statistics about how much lead was mined in Northern and Southern states during the Civil War?
I have seen no good numbers on lead production in the Confederacy -- however, we have the Virginia & Tennessee Railroad data on items shipped east and west each year of the war. Since the only big lead mines in the South were in southwestern Virginia, these eastward shipments probably include all the new lead production.
Years ending June 30, Lead in pigs, rounded
1861 450,000
1862 1,070,000
1863 571,000
1864 500,000
Lead was also shipped through the blockade.
7/20/63 CS Agent in Bermuda, writing to Gorgas, says Lt Col. St. John had written him to impress him with the importance of shipping 40 tons of lead through the blockade every month. That same day, the agent reported to St. John that, in addition to the lead on the R. E. Lee, he still had 1,500 pigs (100 lbs each) and was notifying England of the per month requirement. The book by Vandiver, Confederate Blockade Running Through Bermuda, shows many shipments of lead.
Despite of the above, the South had to melt window sash weights and rain gutters, collected battlefield lead, and still barely had enough for combat demands. The arsenals had numerous stoppages of work making cartridges because of lead shortage and ammunition requirements from armies were frequently shipped short.