Read the paragraph from the section "News Spread Quickly."
Marshall and Sutter tried to keep news of the discovery under wraps. Nonetheless, word got out. By mid-March, at least one newspaper was reporting that large quantities of gold were being turned up at Sutter's Mill. At first, most people in San Francisco doubted the story. However, storekeeper Sam Brannan created wild excitement when he paraded through town displaying gold he had obtained from Sutter's Creek. By mid-June, some three-quarters of the male population of San Francisco had left town for the gold mines. By August, the number of miners in the area had reached 4,000."
Which phrase from the paragraph helps you understand that the gold was a secret at first?