Although salmon are lovely, so too are pristine forests, healthy mountain streams, clean rivers for drinking water and recreation.

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Some of the little mountain streams would have eroded and then collected deposits of that cassiterite: alluvial deposits again.

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There are plenty of mountain walks on the estate and you can also fish for trout in the mountain streams.

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It's early days still for Microsoft, and category trends are changeable, like swiftly flowing mountain streams carving new paths in the hillside.

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The dramatic Hollyford Track starts in the midst of lowland forest, crossing mountain streams and passing pretty waterfalls as it follows the broad Hollyford River valley all the way to the sea at Martins Bay.

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The Maryland researchers concluded that while many fish launch out of the water into the air to capture prey, migrate, or avoid predators, the guppies have a different evolutionary motive: to reach all the available habitat in Trinidad's mountain streams.

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But the search goes on and the rover has enough power to last two years with ancient streams and the slopes of a mountain to explore.

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