<instructions>Your goal is to analyze the following comment and estimate how highly it will be upvoted by the Hacker News community.</instructions><comment><author>giarc</author><text>Here is a coal mine in Alberta [0].  If you turn on the 3D google maps, you&amp;#x27;ll see that it&amp;#x27;s at the top of a mountain.  They transport the coal down into the valley and then onto rail cars.&lt;p&gt;0- &lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;www.google.ca&amp;#x2F;maps&amp;#x2F;@49.6515022,-114.8604751,14053a,35y,37.53t&amp;#x2F;data=!3m1!1e3&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;www.google.ca&amp;#x2F;maps&amp;#x2F;@49.6515022,-114.8604751,14053a,3...&lt;/a&gt;</text><parent_chain><item><author>Z1nfandel</author><text>I thought the same, but then it made me wonder how many mines are built such that you are hauling ore down instead of up?&lt;p&gt;I don&amp;#x27;t know enough about mines, and googling &amp;quot;most common mine design&amp;quot; isn&amp;#x27;t cutting it. Could anyone weigh in with more insight? The only big mines I&amp;#x27;ve seen look to be pits, like the Bingham Copper Mine near SLC.&lt;p&gt;I do remember reading something about ore trains in some Scandinavian country using regenerative braking to power nearby towns and its own trip back up.</text></item><item><author>philipkglass</author><text>&lt;i&gt;Because the vehicle is electric, there is no need to “heat up” the brakes when descending. This is because the enormous electric engine acts as a generator and recharges the battery pack. That same energy is then used to help the vehicle travel back up the hill. Phys reports, “If all goes as planned, the electric dumper truck will even harvest more electricity while traveling downhill than it needs for the ascent. Instead of consuming fossil fuels, it would then feed surplus electricity into the grid.”&lt;/i&gt;&lt;p&gt;Clever. It can do this because it travels uphill empty and comes downhill full.</text></item></parent_chain></comment><story><title>World&apos;s largest electric vehicle</title><url>https://www.empa.ch/web/s604/e-dumper</url></story>
<instructions>Your goal is to analyze the following comment and estimate how highly it will be upvoted by the Hacker News community.</instructions><comment><author>ReadEvalPost</author><text>The two most common types of surface mining are strip mines (where there isn&amp;#x27;t much up&amp;#x2F;down climbing) and open pit mines (where the loaded portion is going up). It&amp;#x27;s possible the mine in question is an open pit mine where your loaded descent to the dump site distance &amp;gt; the loaded climb distance out the open pit.</text><parent_chain><item><author>Z1nfandel</author><text>I thought the same, but then it made me wonder how many mines are built such that you are hauling ore down instead of up?&lt;p&gt;I don&amp;#x27;t know enough about mines, and googling &amp;quot;most common mine design&amp;quot; isn&amp;#x27;t cutting it. Could anyone weigh in with more insight? The only big mines I&amp;#x27;ve seen look to be pits, like the Bingham Copper Mine near SLC.&lt;p&gt;I do remember reading something about ore trains in some Scandinavian country using regenerative braking to power nearby towns and its own trip back up.</text></item><item><author>philipkglass</author><text>&lt;i&gt;Because the vehicle is electric, there is no need to “heat up” the brakes when descending. This is because the enormous electric engine acts as a generator and recharges the battery pack. That same energy is then used to help the vehicle travel back up the hill. Phys reports, “If all goes as planned, the electric dumper truck will even harvest more electricity while traveling downhill than it needs for the ascent. Instead of consuming fossil fuels, it would then feed surplus electricity into the grid.”&lt;/i&gt;&lt;p&gt;Clever. It can do this because it travels uphill empty and comes downhill full.</text></item></parent_chain></comment><story><title>World&apos;s largest electric vehicle</title><url>https://www.empa.ch/web/s604/e-dumper</url></story>