ORI Draft, tiled and hosted on S3

<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>External map layers</title>
<meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' />
<script src='https://api.mapbox.com/mapbox.js/v3.0.1/mapbox.js'></script>
<link href='https://api.mapbox.com/mapbox.js/v3.0.1/mapbox.css' rel='stylesheet' />
<style>
  body { margin:0; padding:0; }
  #map { position:absolute; top:0; bottom:0; width:100%; }
</style>
</head>
<body>

var geosprocketLayer = L.tileLayer('https://s3.amazonaws.com/kivalina-draft/{z}/{x}/{y}.png', {
    attribution: 'Map tiles by UVM SAL. Data by <a href="https://openstreetmap.org">OpenStreetMap</a>, under <a href="https://creativecommons.org/licenses/by-sa/3.0">CC BY SA</a>.'
  }).addTo(map);

var refLayer = L.tileLayer('https://api.mapbox.com/styles/v1/mapbox/streets-v10/tiles/256/{z}/{x}/{y}?access_token=pk.eyJ1IjoibGFuZHBsYW5uZXIiLCJhIjoicUtlZGgwYyJ9.UFYz8MD4lI4kIzk9bjGFvg', {opacity: 0.3})
    //.addTo(map);

map.setView([67.428152, -163.041786], 12);
  
  map.on('ready', function() {
        new L.Control.MiniMap(L.mapbox.tileLayer('mapbox.streets'), {zoomLevelOffset:-7})
            .addTo(map);
    });
  
  var hash = L.hash(map);
</script>

</body>
</html>

Updated missing url https://api.mapbox.com/mapbox.js/plugins/leaflet-minimap/v1.0.0/Control.MiniMap.js to https://api.mapbox.com/mapbox.js/plugins/leaflet-minimap/v1.0.0/control.minimap.js

https://api.mapbox.com/mapbox.js/v3.0.1/mapbox.js

https://api.mapbox.com/mapbox.js/plugins/leaflet-hash/v0.2.1/leaflet-hash.js

https://api.mapbox.com/mapbox.js/plugins/leaflet-minimap/v1.0.0/Control.MiniMap.js