In 1985-with the considerable assistance of Gar Pessel and Janice Hagen-I released "a compendium of data for skarn deposits of Alaska". This work was primarily a literature review and compilation, with some skarn mineral compositions determined by XRD techniques. The compilation showed, among other facts, that there were some serious holes in our knowledge about Alaskan skarns. Since that time the ADGGS has supported Alaskan skarn studies with field assistance, analyses, and microprobe time. I present in this PDF data from these studies over the period 1985-1995. Additional data are given in UAF student theses listed in the references at the end of this document. All the data are also on "quattro" files available with this PDF. Since 1985 a new category of skarn deposit has been recognized, the Gold skarn. This deposit type contains high gold concentrations with relatively low concentrations of Cu and W and is commonly highly anomalous in Te, Bi, As, and Sb (Meinert, 1989). Many Alaskan lode deposits have been mined exclusively for their contained gold, even when other ore elements are present at high concentrations, and skarns are no exception to this tendancy. Hence, production statistics alone are not a good guide to the metal contents-and thus skarn classification-of Alaskan skarns. I have reveised the classification of Alaskan skarns from Newberry (1985) by separating out Au and Mo skarns, employing bulk ore analyses (where available) and otherwise analyses of (representative?) skarn hand specimens and listed these in Table 1.. Scores of additional skarn occurrences have been discovered andlor revealed in the last decade, due to extensive government and industry mapping in Alaska, and these are also listed in Table 1. In this and the following Tables, the skarn types are listed by the following abbreviations: a=Au, c=Cu, f=Fe-(Cu,Au), g=magnesian Fe, m=Mo, s=Sn, w=W, and Z=Zn-Pb. Replacement bodies spatially associated with minor skarn and plutonic rocks (e.g., Liberty Bell, S-Central Alaska) are included in this compilation, but sulfides in marble with no obvious plutonic association (e.g., Reef Ridge, Medfra quadrangle) are not. Table 2 contains a listing of geochemical analyses of skarn samples performed between 1985 and 1995 and not published elsewhere. These were performed by a variety of techniques at several different analytical laboratories, including AA at the ADGGS analytical facility (now defunct), XRF at the University of Alaska, and ICP, AA, INAA, and graphite furnace AA at several commercial laboratories. Data generated by methods of known unreliability (e.g., Sn and W by ICP) are not included in Table 2. Duplicate analyses of several dozen samples by several different reliable techniques (e.g., W by INAA and XRF, Zn by INAA, ICP, AA, and XRF) indicate that the data are generally accurate to better than +I-30%. The samples are derived from a variety of sources: ADGGS pulps previously analyzed for a few elements, samples I collected, and samples donated by ADGGS, USGS, USBM, UAF, and industry ge...
