  The effects of a minimal length are investigated within an algebraically
extended theory of General Relativity (GR). Former attempts, to include a
minimal length in GR are first resumed, with a conformal factor of the metric
as a consequence. Effective potentials for various black hole masses (as ratios
to the minimal length) are deduced. It is found that the existence of a minimal
length has, for a small mass black hole, important effects on the effective
potential near the event horizon, creating barriers which inhibit that
particles can pass the event horizon. Further, a new limit for the minimal mass
of a black hole is derive
