Final answer:
Important inventions during the gold rush included the cradle, long tom, and hydraulic mining technique.
Step-by-step explanation:
An important invention during the gold rush was the cradle. This was a wooden box with a handle that miners used to separate gold from sediment.
Another important invention was the long tom, which was a long trough with riffles that miners could use to wash away dirt and separate gold particles.
The hydraulic mining technique was also developed during the gold rush. This involved using high-pressure water jets to wash away hillsides and extract gold.
Learn more about inventions during the gold rush