Isthmian Gold Work.
Metal-working was unknown to the Mayas of the First Empire, but is abundantly illustrated in cities of the Second Empire, especially Chichen Itza where the pieces are predominantly of Costa Rican and Colombian manufacture evidently secured in trade. We are therefore justified in concluding that the splendid Isthmian gold work came into being after 630 A. D. and was typically developed by 1200 A. D. The “wire technique,” essentially a cast rather than a soldered filigree, characterized metal working as far south as southern Colombia and is also the dominant mode in Mexico. In addition to plain and hollow casting, two kinds of gold plating were carried to perfection by the ancient metal workers: one a heavy plating over copper and the other a thin gilding. The manner in which this plating was done is still uncertain. It has been suggested that the molds were lined with leaf gold or sprinkled with gold dust before the baser copper was poured in. Also acids are said to have been used to dissolve out copper from the surfaces. Many ornaments are of pure beaten gold and have designs in repoussé.
[Plate XXXVII.]
(a) The Gold Work of the Ancient Mexicans excited the Wonder of the Spanish Conquerors. Comparatively few examples, however, have come down to us.
(b) Many Ornaments of Gold are found in the Graves of Costa Rica and Panama. The Keith Collection contains a very fine series of these pieces illustrating all the forms as well as the technical processes.
Fig. 69. Conventional Crocodiles from Costa Rica and Panama.
The gold objects are found in stone box graves along with pottery and stone carvings. Gold is taken from only a small percentage of the graves, probably those of chiefs. A systematic rifling of the ancient cemeteries has been going on since the arrival of the Spaniards, but the finds have mostly been thrown into the melting pot. The burial places are sometimes marked by low platforms built over a group of graves. An iron rod, giving forth a hollow sound when the stone cysts are struck, is used by the searchers. Human bones are found in these graves, but seldom in a state of good preservation.