The ground state of bulk lithium at zero temperature is simulated by t
he variational quantum Monte Carlo algorithm. The total energy and its
constituents are determined for two parametrized sets of trial wave f
unctions. Including correlation by a Jastrow factor the one-determinan
t ansatz consists of either plane waves or a linear combination of Sla
ter orbitals for the Li 2s states. The latter yields results near thos
e of the diffusion Monte Carlo algorithm.