Anyone passing above the Plaza de Mulas must not only have a permit but must pass an examination by a medical team.
No technical crevase or climbing skills are needed for this summit. Just good weather, good endurance, and good acclimitization.
The summit and the mountain in general can be brutally windy.
From the Camp Colera, head up the blunt spine and power up. After about a mile, you pass the Refugio Independencia (a small hut used for emergencies). From here, you cut across a steep face for the next mile. The trail then goes through an open gully for the next 1/4 mile until you make the rounded top where you can finally summit Aconcagua.