The sudden boost of speed by the ship allowed the crew to lose the crowd following them, which meant that as they followed Bob's directions, they ended up being the first ones to find the ore, with no one in sight to compete with them. That was fortunate.
After using the licence to ensure they could dig in this area, the crew immediately got to work,drilling through the ground, reaching for the ore. They didn't have much time. A massive wooden ship out in the middle of nowhere wasn't exactly inconspicuous.
Jack kept lookout, just in case anything unexpected happened, or some competitor showed up. To his immense surprise, nothing happened. Within a few minutes they found the ore, though the entire deposit was about the size of a large fries from WacDonalds.
"Well, that was easy," said Monk, the bear cub who had been silent recently.