Porphyry Mountain

{{Short description|Mountain in Alaska}}

{{Use mdy dates|date=January 2025}}

{{Infobox mountain

| name = Porphyry Mountain

| photo = Porphyry Mountain and National Creek Rock Glacier.jpg

| photo_caption = Northwest aspect of Porphyry Mountain featuring the National Creek Rock Glacier

| elevation_ft = 6375

| elevation_ref = {{cite peakbagger|pid=27824|name=Porphyry Mountain, Alaska|accessdate=2020-02-12}}

| prominence_ft = 1675

| prominence_ref=

| isolation_mi = 3.42

| isolation_ref = [https://listsofjohn.com/peak/156100 Porphyry Mountain, listsofjohn.com]

| range = Wrangell Mountains

| parent_peak = Bonanza Peak

| listing =

| location = Wrangell-St. Elias National Park
Valdez-Cordova Borough
Alaska, United States

| map = USA Alaska

| map_caption = Location in Alaska

| label_position = left

| mapframe = yes

| mapframe-zoom = 8

| mapframe-caption = Interactive map of Porphyry Mountain

| coordinates = {{coord|61.4710069|N|142.8304787|W|type:mountain_region:US-AK_scale:100000_source:gnis|format=dms|display=inline,title}}

| coordinates_ref =

| topo = USGS McCarthy B-5

| age =

| rock =

| easiest_route =

}}

Porphyry Mountain is a prominent 6,375-foot (1,943 meter) mountain summit located in the Wrangell Mountains, in the U.S. state of Alaska. The peak is situated in Wrangell-St. Elias National Park and Preserve, immediately southeast of Kennecott, {{convert|4|mi|km|0|abbr=on}} northeast of McCarthy, and, {{convert|5|mi|km|0|abbr=on}} northwest of Sourdough Peak. Precipitation runoff from the mountain drains into tributaries of the Nizina River, which in turn is part of the Copper River drainage basin. The peak is notable for a rock glacier on its north slope. The mountain was so named because it is largely composed of porphyry, which is a very hard igneous rock.{{cite gnis|id=1408207|name=Porphyry Mountain|accessdate=2020-02-12}} The mountain's local name was reported in 1908 by the U.S. Geological Survey. On a clear day the summit of Porphyry Mountain offers views of Donoho Peak, Kennicott Glacier, and Mount Blackburn to the northwest, and Fireweed Mountain to the west.