Horse Creek is only about 5 kilometres long and flows west into the north end of Surprise Lake, approximately 35 kilometres northeast of the community of Atlin.

The creek is located well within the Late Cretaceous Surprise Lake batholith (Surprise Lake Plutonic Suite) which covers about 1100 square kilometres northeast of Atlin. The batholith is composed primarily of a leucocratic granite with abundant microcline and orthoclase with subordinate quartz. It may or may not contain plagioclase and mafic minerals, most commonly biotite. This body has intruded into Upper Paleozoic volcanic and sedimentary rocks of the Cache Creek Complex.

The creek only received cursory prospecting and development work between 1909 and 1920 and around 373 grams of gold were recovered from the creek between 1916 and 1918 (Bulletin 28).