The Serpentine beryllium occurrence is located at the headwaters of Serpentine Creek, about 6.5 kilometres southeast of Lempriere.

Metasediments and interlayered metabasites of the Semipelite Amphibolite and lower Pelite units of the Hadrynian Horsethief Creek Group host locally abundant pegmatite pods and layers in the area. The region has been affected by three phases of deformation which produced large tight folds and a pervasive, intense foliation. Regional metamorphism is within the kyanite and sillimanite stability fields of amphibolite grade. Temperatures have been estimated at 595+/- 12 degrees celsius and pressures at 5.5+/-0.6 kilobars (Geological Survey of Canada Paper 89-1E, pp. 95-100). This metamorphism has been determined to have occurred at circa 100 Ma, based on field relations, high precision U-Pb zircon and monazite analyses and petrogenetic constraints (Geology, v. 18, p. 103-106).

Beryllium occurrences are fairly numerous in a belt along the northeastern margin of the Western Cordillera region. Cordilleran pegmatites are mainly in areas that are perhaps more highly metamorphosed than areas with nonpegmatite deposits (Geological Survey of Canada Economic Geology Report No. 23).

Pegmatite pods and dykes up to 15 metres thick are found throughout the area and intrude all lithologies. Field relations vary widely, with some pegmatites being folded by phase three deformation while others are not and can be seen to truncate the host rock layering. Pegmatites may be extremely coarse grained with individual muscovite and biotite crystals locally exceeding 15 centimetres (Geological Survey of Canada Paper 89-1E, pp. 95-100).

At the Serpentine showing beryl crystals up to 20 millimetres in diameter have been found in pegmatite (Industrial Minerals File). Refer to the Mica Mountain (083D 019) and Yellow Creek (083D 007) showings for a more detailed description of beryllium-bearing pegmatites.