The Ice Pyramid of Zongo: The 1919 First Ascent of Huayna Potosí

North of the city of La Paz, across the windswept pass of Paso Zongo, rises one of the most perfectly sculpted mountains on Earth: Huayna Potosí (6,088 m / 19,974 ft). In the native Quechua tongue, Wayna P’utuqsi translates to “Young Mountain That Thunders”—a reference to the dramatic avalanches that cascade down its eastern and western glaciers.

With its soaring triangular face and gleaming summit arête, Huayna Potosí dominated the mining roads of the Milluni valley. Yet for decades after Conway climbed Illimani, Huayna Potosí remained unconquered, defended by its steep hanging glaciers and treacherous summit bergschrund.

The German Alpinists from La Paz

In May 1919, two German mountaineers residing in Bolivia—Rudolf Dienst and Adolf Schulze—decided to mount a lightweight assault on the peak. Both men had honed their alpine craft on the limestone walls and glaciated peaks of the Bavarian and Austrian Alps before moving to South America.

Hiring native mules, Dienst and Schulze departed the mining settlement of Milluni and crested the 4,700-metre Paso Zongo. Establishing a primitive camp on the rocky lateral moraines near the tongue of the eastern glacier, they surveyed the upper face through binoculars, identifying a line through the fractured ice plateau toward the high col between the northern and southern summits.

Breaching the Bergschrund

At 4:00 a.m. on May 18, 1919, Dienst and Schulze began their summit assault. The cold on the open glacier was bitter, but conditions were ideal: the snow was frozen into ringing, crystalline firn that held their 10-point crampons securely.

Threading carefully through a maze of gaping crevasses, the pair gained the upper snow plateau beneath the summit pyramid. Here they encountered the primary defense of Huayna Potosí: an enormous, gaping bergschrund cleft in the glacier, backed by an intimidating 55-degree wall of brittle ice.

Schulze anchored firmly into the snow with his wooden-handled ice axe, paying out the rope as Dienst led the technical pitch. Cutting step after step into the sheer ice wall, Dienst pulled himself over the overhanging lip onto the upper crest.

Triumph on the Knife-Edge Arête

From the top of the ice wall, the route narrowed into a terrifying knife-edge arête of wind-carved firn. To the east, the mountain dropped thousands of feet toward the Yungas cloud forest; to the west, sheer quartzite precipices plunged toward the Milluni reservoir.

Moving one at a time with total concentration, Dienst and Schulze balanced along the exposed snow crest. At mid-morning, they reached the narrow summit pinnacle of Huayna Potosí at 6,088 metres.

Looking out across the Cordillera Real, they beheld an unforgettable panorama: to the south, the colossal massif of Illimani; to the north, the sharp needles of Condoriri; and to the west, the deep blue waters of Lake Titicaca shimmering across the Altiplano.

Their successful return to Paso Zongo marked the conquest of one of the finest peaks in South America and established the standard route that would introduce generations of global alpinists to the magic of the high Bolivian Andes.