The heap contains roughly 28 million cubic meters of excavated mining material.
Internal temperatures inside the slag heap have been known to reach several hundred degrees Celsius.
The hill is considered geologically active due to the ongoing internal oxidation and smoldering.
Rare thermophilic flora and fauna, typically found in warmer climates, thrive on the hill's heated surface.
The summit was once higher but has settled over time due to the burning and consolidation of the internal waste.
The heat-generated steam can occasionally cause visible vapor to rise from the surface during colder months.
Halda Ema is a prominent conical hill in Ostrava composed of millions of tons of dumped mining waste from the nearby Ostrava-Karviná coal mines. The internal material has been undergoing a continuous process of spontaneous smoldering due to chemical reactions, maintaining a high internal temperature. This internal heat prevents snow from accumulating on the summit and allows for the growth of thermophilic plant species rarely found in the region. The site rises to an elevation of 315 meters above sea level, providing a panoramic view of the Ostrava industrial basin and the Beskydy Mountains. Once a restricted industrial zone, it has evolved into a public urban hiking destination. Smoke and steam may occasionally vent from cracks in the ground, a visual testament to the ongoing internal combustion. The terrain remains rugged and consists primarily of unstable, dark shale and coal slag.
The highest point of the summit overlooking the Ostrava industrial panorama.
Wear sturdy, closed-toe hiking boots, as the ground is uneven and contains sharp slag.
Stay strictly on marked paths to avoid contact with hot spots or unstable ground.
Bring a windbreaker, as the open summit is frequently exposed to strong gusts.
Do not wander off the marked paths, as the ground can be dangerously hot and unstable.
Respect the warning signs; do not dig into the soil or move surface rocks.
