“Now allow me to substitute this diagram,” said Jack, spreading a larger tracing before them. “This is the same as the other with the addition of a portion of the boundary lines and underground workings of the adjoining claim, the Yankee Boy.”

“Ah, I see,” said Houston, “the tunnel from the Lucky Chance has been carried beyond the boundary line in such a direction as to strike the vein of the adjoining claim.”

“That is it exactly,” said Van Dorn, “no wonder the mine pays well!”

“As I stated before,” continued Jack, “these measurements, and, to a certain extent, the course of the tunnel, are given approximately, as I had no means of ascertaining the exact data, but I know they are essentially correct. It only remains for you, gentlemen, to verify this, by making an examination of the tunnel and taking the courses and measurements exactly, and also by comparing the ore now taken out with that originally found in the mine, and with the ore of the Yankee Boy, and you will then have evidence of the greatest fraud which has been perpetrated upon the rightful owners of the Yankee Boy, and which has been carried on for the last four or five years.”

“But how did you discover this?” asked Houston.

“I first came here,” replied Jack, “shortly after the sale of the Yankee Boy group of properties had been consummated. Within a few months afterward, the company located the Lucky Chance mine; development work was carried forward as rapidly as possible, quite a number of men being employed, of which I was one. It was evident that in locating this mine, the company hoped they had struck an extension of the vein of the Yankee Boy lode; it proved of an entirely different character, however, yielding rather a low-grade ore. The claim was surveyed and patented as soon as the necessary amount of improvements, required by law, had been placed upon it. After obtaining patent, the company then extended the tunnel in an entirely different direction, and, as you will find upon investigation, beyond the boundary line, until it intersected a portion of the Yankee Boy vein. Here a body of very rich ore was struck, and the mine has been a paying property ever since. For this last work very few men were retained, and but few have been employed there since, those few being men whom the company thought could be trusted, or upon whom they had some hold by which they could compel them to silence. I was employed there until very recently, and from the first had a thorough understanding of the course and extent of the different workings, and consequently am perfectly familiar with them.”

“Everard,” said Van Dorn, for whom work of this kind possessed a special attraction, “I think this is just about the kind of an expedition we will like.”

“I think so myself,” Houston replied, “but at the same time, it is the most risky piece of work we have yet undertaken, and we will have to depend upon our friend here for suggestions and advice. You will of course accompany us?” he added, turning to Jack, who had withdrawn from the table and was sitting in the dim light.

“Certainly,” responded Jack, “it would be a very dangerous undertaking for two strangers to go through that part of the mine without a guide at any time, especially at night, and it will be at best, a hazardous piece of work.”

“How many are employed there? and what class of men are they?” inquired Houston.