For more than a mile they carried the levels over the bowlders of the gradually sloping bottom of that stupendous gash in the mountain side. So far the work was fairly easy. At last, however, they came to the place where the bed of the gulch suddenly tilted upward at a sharp angle and climbed the tremendous heights to the top of High Mesa in sheer ascents and cliff-like ledges. Blake established a bench-mark at the foot of the acclivity, and came forward beside Ashton to peer up the Titanic chute between the dizzy precipices. From where they stood to the head of the gulch was fully four thousand feet.
“What do you think of it?” asked the engineer.
“I think this is where your line ends,” answered Ashton, and he rolled a cigarette. He had been anything but agreeable since their start from the ranch. 186
“We of course can’t go up with the level and rod,” said Blake, smiling at the absurdity of the suggestion. “Still, we might possibly chain it to the top.”
Ashton shrugged. “I fail to see the need of risking my neck to climb this goat stairway.”
“Very well,” agreed Blake, ignoring his companion’s ill humor. “Kindly take back the level and get out the chain.”
Ashton started off without replying. Blake looked at the young man’s back with a regretful, half-puzzled expression. But he quickly returned to the business in hand. He laid the level rod on a rock and inclined it at the same steep pitch as the uptilt of the gorge bottom. Over the lower end of this he held a plumb bob, and took the angle between the perpendicular line of the bob-string and the inclined line of the rod with a small protractor that he carried in his notebook. The angle measured over fifty degrees from the horizontal.
Having thus determined the angle of inclination, the engineer picked a likely line of ascent and started to climb the gulch chute. He went up in rapid rushes, with the ease and surefootedness of a coolheaded, steel-muscled climber. He stopped frequently, not because of weariness or of lack of breath, but to test the structure and hardness of the rocks with a small magnifying glass and the butt of his pocket knife.
At last, nearly a thousand feet up, his ascent was stopped by a sheer hundred-foot cliff. He had seen 187 it beetling above him and knew beforehand that he could not hope to scale such a precipice; yet he clambered up to it, still examining the rock with minute care. As he walked across the waterworn shelf at the foot of the sheer cliff, his eye was caught by a wide seam of quartz in the side wall of the gulch.
Going on over to the vein, he looked at it in several places through his magnifying glass. Everywhere little yellow specks showed in the semi-translucent quartz. He drew back across the gorge to examine the trend of the vein. It ran far outward and upward, and in no place was it narrower than where it disappeared under the bed of the gorge.