Some numbers on silver shipments (well I think it's the total, but most of the value was in silver rather than gold)
From Parry,
The Spanish Seaborne Empire
Code:
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1541-1550 1000000 peso
1591-1600 7000000 peso
1601-1610 5581000
1611-1620 5464000
1621-1630 5197000
1631-1640 3343000
1641-1650 2553000
1651-1660 1065000
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This is supposed to be shipments, but I don't know if it's total or crown shipments.
From Elliott
Imperial Spain (well I think that's the title)
Code:
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year crown total
1503-1505 117 445
1506-1510 257 979
1511-1515 376 1435
1516-1520 312 1192
1521-1525 42 161
1526-1530 326 1246
1531-1535 519 1980
1536-1540 1621 4725
1541-1545 909 5945
1546-1550 1911 6610
1551-1555 4354 11838
1556-1560 1882 9598
1561-1565 2183 13449
1566-1570 4542 16969
1571-1575 3958 14288
1576-1580 7980 20702
1581-1585 9061 35250
1586-1590 9652 28599
1591-1595 12028 42222
1596-1600 13169 41314
1601-1605 7824 29284
1606-1610 10260 37686
1611-1615 8656 29434
1616-1620 5217 36135
1621-1625 5869 32413
1626-1630 5543 29945
1631-1635 5681 20533
1636-1640 5630 19578
1641-1645 5723 16516
1646-1650 1998 14125
1651-1655 2687 8753
1656-1660 728 4033
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A couple of points though
-the crown numbers don't drop off as much as the total, and the crown proceeds might track production better than the total.
-shipments are not the same as production because there was a dramatic increase in the shipment of bullion to the Philipines and then on to Japan, China and India in the period of decline
-throughout the period there was a some degree of smuggling, and as the taxes rose it seems to me that smuggling probably rose too.
-by the mid-18th century shipments were pretty much back to their peak level - around the same as in 1600.
The decline is generally attributed to labour shortage due to the demographic collapse in the Americas. When you only have 1/10 of the population it's hard to get enough slaves into the mines. Usually 1650 is seen as the low point in the population of Latin America.
The other factor was the exhaustion of the surface lodes. The 18th century recovery was due to capital investment to allow exploitation of deeper ore.